13 votes

Would a small amount of bottled water mixed in with an aquarium harm the fish?

Don't panic, it's probably okay! The key thing here is that you caught the error and asked the question. I'll cover both bases here and try and explain a few things (forgive me if you already know ...
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9 votes
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How can I reduce my need to do a water change on my turtle's habitat?

There are a few ways to reduce the frequency of water changes for your turtle. Just keep in mind there is no running away from water changes. Have an efficient biological filter: This very obvious ...
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9 votes
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Why do you need to change the water in your fish tank?

One of the primary reasons for water changes is to remove harmful waste and chemical compounds from your tank that tend to build up over time. This is especially important in new aquariums where ...
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8 votes
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What is special about an aquarium using no carbon dioxide, no fertilizer and no filter?

It is special in a sense that most aquarium setups include a lot of equipment, mainly a filter; the filter facilitates cultivation of nitrifying bacteria that are responsible for neutralization of ...
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  • 105
8 votes
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Fish swimming with mouth always touching the water surface

Fish swimming with their mouth constantly glued to water surface is a sign that they are gasping for breath. However, the reason for them being short for breath usually isn't the low oxygen ...
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  • 105
7 votes
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How do I do a water change in my fish tank?

Water changes are almost what they sound like, you're changing the water in the tank. But, with very few exceptions, you never want to change more than 50% of the water in the tank. Water changes that ...
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7 votes
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Is there a way to test the amount of dissolved oxygen in a tank?

You can buy a dissolved oxygen meter, but they'll generally start in the US$200 to US$400 range, and a suitable one I believe runs closer to US$500-600. Not exactly an everyday piece of equipment for ...
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7 votes
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Best way to adjust fish tank water chemistry

Firstly, I'll go for my old refrain "consistency is key". It's better to have consistent water parameters than changing them continually to 'chase the perfect conditions'. Firstly, your nitrite ...
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6 votes

Can I add soda water to my tank to supply CO₂ for my plants?

Soda water uses carbonic acid to produce CO2 so in theory it should work, but it is not that easy: carbonic acid is as the name says an acid, and any type of acid will lower the water's pH too fast ...
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6 votes
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What are normal pH fluctuations, and what could be causing extreme fluctuations?

The pH should not change more than 0,2 during 24 hours. If it is more, it can stress your fish. The goal is to have a neutral pH of 7,0 for most fish, but this is very dependent on the type of fish ...
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5 votes

Need advice on handling a recently recovered sick betta

I highly doubt that water change would stress her that much. However here is what you do. Prepare gigantic batch of good water, get two tubes and another empty bucket. And then use dripping method. ...
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5 votes
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Why do my Glofish Skirt tetras stay on surface after 30% water change?

When fish goes to the surface of the water there is some thing wrong, like the lack of oxygen or the presence of poisonous substances in the water. The water test you are using is not reliable and it ...
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5 votes

CO₂ supply with KH 0 - pH effect

It sounds as though you already have a good knowledge of how water chemistry works. In basic terms, KH (carbonate hardness) affects how much the pH can change within the water. The presence of the ...
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5 votes
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Is a carbon or cartridge filter necessary in an aquarium with a simple biofilter?

Firstly, thank you for reading about the nitrogen cycle before getting fish! That's a +1 straight away. Biofilter is a bit of a funny term, really, because all filters technically become biofilters as ...
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5 votes

New betta problems - I was unaware of cycling before new tank

1. Get a water test and update your question with the readings of pH-ammonia-nitrite-nitrate. 2. Stop feeding your fish to get the bioload down. 3. Keep changing water 20% each day (use dechlorinator ...
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5 votes

Can't reduce my nitrite/nitrate levels, any help appreciated!

The first thing you need to do is to add some aquarium salt, this is done to counteract the effect of the nitrite on your fish' gills. The aquarium salt concentration to use is 0,3%. Do water changes ...
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4 votes

All my fish in reef tank died

Lots of things can go wrong. Here are some ideas: pH or ammonia spike : The larger the tank, the less likely spikes are, but all of my catastrophic failures like this were due to spikes Power outage :...
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  • 2,466
4 votes

Temperature Range for Fancy Goldfish

You're correct about the oxygen. Warmer water dispels oxygen faster than cooler water. Sometimes the water returning from the filters is enough to add enough oxygen for fish, but sometimes it does ...
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4 votes

High nitrate level in tap water

First things first: your tank is not ready to house fish. When setting up a new tank, you need to cycle the water for a few weeks (typically a month or two) so beneficial bacteria can start to grow. ...
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  • 352
4 votes

Aquarium is stuck on a nitrite spike

Basically it is indeed a patience game. But how often do you change the water, and how much? Since your doing a fishless cycle (which is indeed the recommened way to do it), you don't actually have to ...
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4 votes
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Axolotl nitrate levels high- more frequent water changes?

Water changes will indeed reduce nitrate levels within your tank and with 80ppm you'll definitely want to reduce that as soon as you can. You could increase the percentage of your water changes, but ...
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  • 5,125
4 votes

Can I add soda water to my tank to supply CO₂ for my plants?

First we need to clarify, what is exactly in the bottled water: To make it sparkle, the companies add CO2 gas. (In some dwells this gas was taken by the water, when dropping through the different ...
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  • 5,657
4 votes

Massive koi death in pond, without an apparent reason -- need help!

What I think might have happened before your koi started to die is this. As the temperature in your pond got above 20 °C, the koi eggs started to mature, and after some days of temperature still ...
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4 votes

Is the filter change necessary?

No, you do not need to change the filter material. But what you need to do is remove the charcoal and replace it with new filter foam (filter sponge). The charcoal is only needed if you are removing ...
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  • 18.8k
4 votes

Would a small amount of bottled water mixed in with an aquarium harm the fish?

First, as Henders says, this is almost certainly not an issue at all. But I would continue to use tank water to thaw the krill from here on out. In fact, I'd go a step further: you can put the tank ...
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4 votes

What’s wrong with my Betta fish?

It's always hard to identify when a fish is doing poorly. But what I always recommend is making sure they have the right environment. That's always key to having a healthy fish. Once they're in the ...
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  • 2,378
4 votes

New GloFish are staying at top and sides of tank, not swimming around

Sorry to hear about your fish. Please don't despair, a lot of shops set you up to fail. From the sounds of what you've written in your question, you did everything right. Firstly, make sure you read ...
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4 votes
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Female guppies are fine, but male is sick

High concentration of nitrite ions (1 mg/L of NO2-) is the most concerning thing in the list of your water parameters; it is many times above the toxicity threshold, because nitrites may start to ...
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  • 105
4 votes

Why do my Betta fish keep dying?

The existing answer gives a good course of action and one of the comments suggesting the source of the fish (i.e. the local fish store) might be a good one to follow up. Some fish stores even offer a ...
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  • 606
3 votes

Can I switch from using distilled water to tap water in aquarium?

It depends. As others have mentioned, the quality of water in different places is always different. To determine if your water is suitable for aquarium usage, run a battery of tests with the water, ...
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