Questions tagged [filters]

Filtration systems for aquariums and ponds. Issues relating to man-made of natural filtration.

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Salt water aquarium on a jetty over the ocean, with no filtration just constant ocean water circulation

I am very fortunate to be living in Raja Ampat, West Papua, one of the richest areas in the world for biodiversity. I also live directly on top of a fringing reef. My house is on stilts over the ...
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2 votes
1 answer
99 views

Aquarium with mud production that clogs the filtration system

I've had a 120 L aquarium for a few years; about 40 small fish are in it (including 6 Corydoras paleatus and 12 fire tetras). Now, as of a few months ago, I've noticed that the filter, the sponge, and ...
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3 votes
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How long should I leave old filter in new tank after installing a second, new filter to replace the old one? [duplicate]

Hi I started a tank a week ago with 3 guppies in my daughter's room, but the HOB filter was too loud, so I have now changed to Fluval U2. I have both filters in tank now since yesterday, but my ...
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1 answer
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What is this white-ish buildup on my fish filter?

What is this white-ish buildup on my fish filter? Should I be cleaning more often?
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2 votes
0 answers
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Too much solid debris after filter media change

I have my tank for about 10 years now. Three years ago filter stopped working and has been replaced with Tetra that was available at hand. It was working fine until couple months ago. It is still ...
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1 vote
1 answer
102 views

How to maintain a snail tank without a filter?

I have received a rabbit snail, two golden Incas, and a nerite. I only have a 10 gallon tank and my parents will not allow me to get a filter for it. I am a first time keeper and very worried about ...
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5 votes
2 answers
108 views

Why are undergravel aquarium filters no longer popular at stores?

I recall that when I started fish keeping, there were basically two choices for filtration: under-gravel filters and hang-on backs. There were also expensive canisters for people with large setups. ...
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Keeping fry out of canister filter?

I have a ~1000 gallon pond in my yard. It contains mosquitofish and goldfish. The pond currently has 2 of these submersible filters similar to this: However, to clean the filter, I need to wade into ...
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2 votes
1 answer
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8.0ppm ammonia spike that's been "in effect" for about a week or two

OK, so I went into fish keeping way too fast with almost no knowledge. I will give a short rundown of what happened in my tank. I got a 5 gallon (19 liters) tank and a silver molly and a leopard ...
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2 votes
2 answers
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Sponges for mechanical particle filters for aquariums

A colleague just started the fun with dealing with a big aquarium (his first). He asked for my advice, and I provided my best. However, being both engineers, we started discussing out-of-the-box ideas ...
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When (or If) to reseal an sump?

I bought a glass sump (intended for a fresh-water tank) 2nd hand that has clearly been put together at home. The construction looks great, but you can tell its homemade since the seal has "frayed ...
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1 vote
2 answers
964 views

My new goldfish is gasping for air

Today I went to the pet shop and got a goldfish. My tank is 20 litres, and the goldfish is pretty small. When I first got the fish, it was gasping and eating the bubbles in the bag. I thought this was ...
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0 votes
1 answer
53 views

How is GFO reactor better than PhosBan medium in the filter?

I have a cyanobacteria problem. I am using PhosBan/Phosguard as a filter medium and it doesn't really work that well, shall I worry of getting a GFO reactor or am I good with how it is? How would GFO ...
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1 vote
2 answers
5k views

How do I fix BAD betta fin tearing?

I’ve had my betta for a month now and hes been PERFECT!! I just looked at him now and saw that his tail is SHREDDED!! I realized that he had been glaring at the filter in the back and KNEW that he’d ...
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3 votes
1 answer
14k views

Why does my nitrate level always read 0?

I have the following tanks: 5 gallon, 2 months old - housed betta and shrimp 10 gallon, 2 weeks old - used established media to seed aquarium alongside cycle and beneficial bacteria 3.5 gallon - ...
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4 votes
1 answer
341 views

Is a carbon or cartridge filter necessary in an aquarium with a simple biofilter?

I'm trying to setup my first aquarium, and in the process I've been reading all about the nitrogen cycle and properly cycling a tank to ensure there are bacteria present to work on the ammonia and ...
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2 votes
0 answers
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Starting up a canister filter that has been off for a while

We prepared an Eheim canister about a week ago and had also put some tank water in it but, because of a series of setbacks, we haven't been able to start the filter in our new tank. We are still not ...
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4 votes
2 answers
792 views

Juwel Filter Pump Too High?

We have a Juwel Lido 200. The black filter box was on the right side of the aquarium; but we wanted to move it, so we removed the silicone and re-siliconed it on the left-side of the aquarium instead. ...
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2 votes
1 answer
394 views

Noisy canister not pumping

I've had this Sunsun 304b canister for a few years now. It was very quiet originally but in the last few years has gotten noisy. And then two weeks ago it stopped pumping suddenly making a loud ...
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2 votes
0 answers
1k views

Why do fluidized sand filters need a prefilter?

When talking fresh water fish tanks, why do people recommend that fluidized sand filters have a prefilter like a sponge? Assume there is a separate system for removing solid waste from the tank, like ...
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2 votes
1 answer
129 views

What is the correct order of elements in Haqos EX1500 External Aquarium Filter

After looking at some youtube videos and investigating this filter, I think that some info on the web is either incorrect or simply unsuitable to the HAQOS EX 1500 External Canister Filter. What is ...
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6 votes
2 answers
961 views

Why is a biological denitrification filter considered cheap to build and operate?

I found more than one (old) websites (in German) (http://www.teichratgeber.de/wodkafilter_bau01.html and http://www.ohligers.de/Nitratfilter1.htm and there're probably more) which consider a ...
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1 vote
0 answers
221 views

Create air intake from submerged water pump…?

I'm setting up a wet / dry aquarium filter and I'd like to handle both the water return and the protein skimming (foam generation) with only 1 submerged power head, a situation consisting of 1 ...
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4 votes
5 answers
14k views

How many grams of ceramic rings do I need in my filter?

I'm using ceramic rings as filter media for biological filtration. For a given aquarium size, how many grams of the ceramic filter media do I need? The packet doesn't have sizing instructions. I also ...
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2 votes
1 answer
1k views

Aquarium filter... what's the order?

Yesterday I bought a filter (top filter): a Sea Star HX-1480G, with F.Max at 2800L/H (which means that it has a flow rate of 2800 liters of water per hour). I installed 1 layer of a polyfiber pad at ...
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2 votes
1 answer
193 views

Can an understock tank be under filtered?

I asked this question a couple of month ago, I suggest you read it first so you know the context. I have a 15 gallon tank with 10 neon tetras, 4 zebra danios, 2 Endlers and a bunch of red cherry ...
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2 votes
1 answer
161 views

What's the purpose of a gravel blockage of a mat filter?

On a picture in the German Wikipedia article of a mat/Hamburg filter I see a gravel blockage (plastic piece at the bottom of the fixation glued to the ground) and was wondering about its purpose: (...
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9 votes
3 answers
3k views

How to upgrade fish to a much larger aquarium

I currently have a 15gal tank fully cycled. The tank is stock on the heavy side of thing and I purchase a larger tank (75gal) for another project I will not be doing finally. So I will use the larger ...
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4 votes
1 answer
694 views

When is (more) aquarium bio-filtration overkill?

I have a 75 gallon freshwater aquarium with a pretty heavy fish load (7 giant fist-sized+ blood parrots). But I also have a giant Eheim 1200XLT canister filter running with gallons of various bio ...
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4 votes
1 answer
697 views

Does Juwel Cirax (ceramic biological filters) affect pH in the aquarium

Currently the water in my aquarium is having a higher pH than I want. What I wonder is if the Cirax filter (and in general biological ceramic filters) affects the pH value (by increasing it, or if it ...
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4 votes
2 answers
280 views

Better solution for holding appliances inside the aquarium?

We've all seen these devices. They're the suction-cup clamps used to affix heaters, filter intakes, tubing, and other appliances inside the aquarium. But the suction cups quickly deteriorate and no ...
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3 votes
1 answer
3k views

Why should I replace my filter media?

When I search the internet about this question there are many different opinion about the right interval to change filtration media in a regular freshwater tank. On the packaging of different media ...
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5 votes
1 answer
4k views

How long to wait before I remove the old filter?

I have recently purchased a sponge filter just like this one. I added it to my tank when it arrived home about a week ago. My tank has been running for over 4 months now. The tank has been stocked for ...
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4 votes
1 answer
6k views

Black goldfish with its fin clamped down

We have two small fish in our tank, they seemed very happy until about a week ago. They both became fairly inactive and had their dorsal fins clamped down against their backs. We thought it might be ...
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6 votes
2 answers
6k views

Aquarium overflow vs bottom of tank intake

Wouldn't something that sucks out detritus from the bottom be better than something that can only pull floating stuff? Reasoning: A wet/dry filter will usually feature an overflow, whereas other ...
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3 votes
1 answer
3k views

How can I reduce my need to do a water change on my turtle's habitat?

Hello turtles masters :) I have 20cm (shield) turtle in 70L of water in aquarium. As a filter I use Repti Clear F350 (276L/hour 6W). I also use ReptoFresh and ReptoSafe. Problem: Even I clean the ...
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10 votes
5 answers
47k views

How long can an aquarium remain without any filter and heating?

The filter and the heating of my aquarium do not work anymore. After trying to solve the problem, I've concluded that the only way to solve the problem is to buy a new filter and a new heating. Can my ...
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3 votes
1 answer
3k views

How well does an internal filter keep water oxygenated?

I'd like to use Tom's Internal Filter which is an internal multistage filter, but I'm not sure if I'll get any oxygenation. Background: I now have a three gallon tank and I'm trying to figure out ...
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1 vote
1 answer
339 views

What remaining equipment do I need for a marine aquarium? [closed]

I want to convert my soft water aquarium into marin aquarium, but before I do that I want to make sure I have all the required equipments and few critical equipments in spare as well. I already have ...
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9 votes
2 answers
9k views

Can I run Undergravel Filter in Reverse to Keep the Gravel Clean?

I current have a 75 gallon, unplanted aquarium in which I have NO gravel at all. I removed the gravel years ago because I liked the clean look… and not having to vacuuming the gravel to remove ...
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4 votes
3 answers
2k views

Under gravel or sand filter for aquarium

Is it better to have an under gravel filter than the traditional out of water filter that sits on top of the aquarium? I keep an air hose on during the day that blows bubbles and have live plants. ...
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6 votes
2 answers
26k views

Is it safe to move fish and all equipment to a new tank?

I currently have a 10 gallon (38 L) tank with the following fish: 1 male dwarf gourami; 6 glowlight tetras (4 female and 2 male). Here's my current setup: "Aqueon 10" filter (labeled as being ...
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11 votes
3 answers
18k views

Why are my fish dying?

Since moving house 8 weeks ago I've inherited a fish pond, containing around 20 fish, which is 270cm in length, 130cm wide, and 35cm deep in the middle. It uses a Hozelock Cyprio Ecopower Plus 5000 ...
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8 votes
1 answer
282 views

What is a "sump" when talking about aquariums?

I always thought that sumps were a part of the basement where water that seeps into the basement collects. We would have to use a "sump pump" to make sure that the basement didn't flood during/after ...
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6 votes
1 answer
113 views

Filtration of smaller ponds

I've asked some questions about my goldfish What indicates whether my outdoor goldfish are healthy or ill? and noticed a lot of response referring to the likelihood that fish would survive in such an ...
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16 votes
1 answer
4k views

Do I need a bubbler in my aquarium?

I have an aquarium of 280 liters (~ 74 gallons). I use an external filter, so the water returns to it like a small waterfall. Do I need a bubbler to improve the O2 level of my aquarium, or adding one ...
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14 votes
2 answers
3k views

How do I know when I need to replace the charcoal in my aquarium filter?

I recently purchased and installed an External Canister Filter in my aquarium which includes a filter stage with little bags of charcoal media. Clearly I need to replace this at some interval because ...
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