Questions tagged [goldfish]

Questions and issues regarding goldfish - one of the most popular aquarium fish. Use with other relevant tags, such as `feeding` or `health`

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23 votes
7 answers
14k views

Cooling a goldfish tank during summer

During the peak of last summer we had several goldfish that died after several days of hot weather and I suspect it was related. According to the Goldfish article on Wikipedia: Extremely high ...
PeterJ's user avatar
  • 1,324
17 votes
4 answers
13k views

Is it true that goldfish growth is limited by container size?

As I grew up, I was taught that a goldfish will only grow to a certain point dependent upon the size of their container and how many fish are in the container; all the fish within the same container ...
user avatar
14 votes
1 answer
5k views

Goldfish unresponsive, what should I do?

I have a common goldfish that lives in a 20 gallon tank by herself with a filter and heater. Recently she has been showing signs of swim bladder disease because she wouldn’t swim properly. After ...
Emma's user avatar
  • 141
11 votes
1 answer
301 views

How to determine the gender of a goldfish?

How can I determine the sex of a goldfish? The only clues I heard so far were to wait for spawning season, or try to see the shape of the vents, but this get a little trickier if you´re not ...
woliveirajr's user avatar
  • 4,034
8 votes
1 answer
653 views

Is my goldfish ok on his own in a pot pond?

I have three big outdoor pot ponds for goldfish. There were three living in a pot together for 2-3 years. I then moved the biggest fish into a separate pond pot by himself, as he was bumping at one of ...
user avatar
8 votes
1 answer
26k views

Goldfish coming to the top of bowl and releasing bubbles

I've recently got a pair of goldfish and put them in a bowl. I'm trying to keep them happy by feeding them all the natural thing they eat in the wild (and they are loving it too). It has been 4 ~ 5 ...
0x550x42's user avatar
  • 181
6 votes
1 answer
281 views

Do smaller numbers of goldfish form pairs?

I've been asking a lot of questions about goldfish, as I am preparing for a bigger pond. I currently have three comets that I will move to the bigger pond. The pond will be approx 350 L so there ...
user avatar
6 votes
1 answer
150 views

Plants for dirty/algae ridden goldfish aquarium

I have a 20 gallon (70 liters) freshwater aquarium with two comets, which are now about 2 inches each. The aquarium gets dirty with algae covering the glass and all the plants very quickly after ...
DaveO's user avatar
  • 161
5 votes
2 answers
14k views

What is this lump on my goldfishes head?

I just noticed today that my goldfish has a lump on his head that is white around the edge with a red centre. He is eating and behaving normally. He is nine years old and has never had any other ...
Katie's user avatar
  • 111
5 votes
1 answer
542 views

Goldfish with white spot/fungal infection/something else?

Does anyone know what this is and how to treat it? One has a white lump near its eye, the other some white stuff at the end of its fan tail. Both are usually in a pond with others, but are currently ...
Rob's user avatar
  • 153
5 votes
1 answer
229 views

Could having fallen onto the floor have changed my goldfish's behavior?

I have a tank with three goldfish in it. Some weeks ago, I had to do a 100% water change and had to take the fishes out. While returning them to the tank, one of them, an Oranda, jumped off and hit ...
help_for_goldfish's user avatar
4 votes
2 answers
2k views

How can I get rid of a goldfish

A few weeks ago my wife rescued a goldfish from a public fountain. We put it in a fishtank lended by our neighbors then we installed a filter and some decorations. The thing is that : after a few ...
Mathieu's user avatar
  • 151
4 votes
1 answer
1k views

Dried goldfish became alive after re-introducing into water

Anecdote My relatives went on a trip leaving behind their goldfish. When they returned, they noticed that a fish had jumped out of the water and had become dry, apparently dead. But the fish was put ...
Megidd's user avatar
  • 165
4 votes
3 answers
4k views

Is changing water daily in a fish bowl harmful to the fish?

I have two goldfish and have kept them in a fish bowl for now. As I do not have a water filter in there, should I change the water daily in the bowl? It does seem a bit dirty after a day, but I don't ...
Anik Kaur's user avatar
4 votes
1 answer
232 views

Can goldfish jump out of water?

Previously I asked "Can goldfish be Trained?" and the answer was yes. But my plan is to train my fishies to jump out of the water get food. I did a Google image search and it looks like goldfish can ...
Coomie's user avatar
  • 215
4 votes
1 answer
172 views

Can goldfish have opinions?

I have two goldfish for 2 years named Archimedes and Nelson. They lived in an aquarium with big white gravel. I changed their soil with dark blue pebbles as a result of advice given by my breeder. A ...
PaulieJackdaw's user avatar
4 votes
1 answer
206 views

Can goldfish be trained?

I've recently got a family of goldfish and I want to encourage them to be interactive. Can they be trained? Background: I have 3 comet goldfish. During the transition to their tank, I must have ...
Coomie's user avatar
  • 215
4 votes
2 answers
36k views

What is this tufty white spot on my goldfish's head?

I noticed today that my goldfish, Thunderbolt, has a tuft of white on its head. Note: Same fish. coloration difference due to camera flash I've had the fish in a 10 gallon tank by itself for ...
theforestecologist's user avatar
4 votes
1 answer
562 views

Feed goldfish off-schedule or skip a day?

I missed feeding time and my goldfish were sleeping by the time I got to them. I thought it would be better to let them be and just feed them the normal amount at feeding time the following day. Was ...
Aryeh Leib Taurog's user avatar
4 votes
1 answer
2k views

Temperature Range for Fancy Goldfish

I have an aquarium housing moors and an oranda. What is a safe temperature range for these fish? There seems to be conflicting information on this online. My aquarium is in a conservatory and in the ...
Mitch's user avatar
  • 41
4 votes
1 answer
254 views

My goldfish started growing a flower-like thing on his head and it is now disturbing it during eating

My pet goldfish, Mentos, has a flower-like structure growing on his head. At first, we didn't take it as a big issue. Now, it started concerning us and the fish itself because it blocks him from ...
Anarghya's user avatar
4 votes
1 answer
338 views

Can I use these medicines for my sick fish

My goldfish is sick and I am not very good at this. The fish has got white elevated growth/spots and the edges of the fins also have some growth. Here are the pictures of the fish: Here are two ...
user2636664's user avatar
4 votes
1 answer
7k 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 ...
Phil's user avatar
  • 71
3 votes
1 answer
560 views

Goldfish behaviour after medication

My goldfish was showing signs of illness, then started shredding its tail and losing its colour - I did a complete water change and cleaned the filter and tank/gravel. I purchased some Tri-Sulfa ...
Nejla's user avatar
  • 31
3 votes
3 answers
2k views

What substrate/base should I use for this small fish pond?

I have bought a property that has a tiny decorative pond with waterfall and sizeable filter. It looks as though a larger pond use to be in its place. I plan to install this product: https://www....
Steerpike's user avatar
  • 133
3 votes
2 answers
7k views

Help. A common goldfish living in 3 gallon tank

My wife got a goldfish from our pre-school. It came in a "fishbowl" the size of a large coffee cup and a tiny ziplock with fish food. It was severely stressed: fins clamped at his side, sunken belly, ...
C.J.'s user avatar
  • 51
3 votes
4 answers
4k views

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

I have always given my fish distilled water but I recently got a larger tank. Would it be dangerous to give them tap water with water conditioner in it, if I have been giving them distilled water?
Maya's user avatar
  • 39
3 votes
2 answers
1k views

My goldfish is dying

I have had 2 goldfish for 2 years in my aquarium. This one was good last night. I don't know what happened today it is somehow floating on side with little movement, like sleeping. I put it outside of ...
Tina J's user avatar
  • 161
3 votes
2 answers
129 views

Looking for an automated aquarium

I'm looking for a fully automated aquarium. Need an automatically timed feeder for the fish Could the aquarium could automatically clean itself A battery backup for both the feeder and the cleaning ...
mk117's user avatar
  • 131
3 votes
2 answers
4k views

Why do my goldfish keep dying?

I have had a number of goldfish (three pairs of two) over the last six months or so. In all cases they have lasted about 2 months before dying. I have no idea what I'm doing wrong so here is all (...
Phil's user avatar
  • 71
3 votes
1 answer
294 views

Is fish pecking at other fish a sign of parasites?

I setup two quarantine tanks, the first with some 2" koi, comets, ryukin, and orandas, the second with some very fancy, slow-moving goldfish. Both tanks seemed to be doing fine, colorful and ...
Village's user avatar
  • 353
3 votes
2 answers
133 views

How to reduce excess micro-algae in pond

I have a small pond (I don't really know the volume, maybe 400 liters) with goldfish inside, they seem healthy with no apparent problem. The pond is constantly invaded by micro-algae that cannot be ...
Yeeter's user avatar
  • 138
3 votes
1 answer
3k views

Is my fish suffering from fin rot or is this just a sign of wear and tear?

I've had this goldfish for around 2 years now, and have no problems with it at all. I changed it over to a bigger tank (22 litre) around 3 to 4 months ago, and until now have had no issues. The tank ...
Josh's user avatar
  • 33
3 votes
1 answer
223 views

How do I tell if my goldfish is pregnant?

I'm new to keeping fish. I picked up 3 comet goldfish a couple of months ago. They've been living in the same tank and one is getting bigger, way bigger than the other 2. Is it pregnant? How can I ...
Coomie's user avatar
  • 215
3 votes
1 answer
469 views

How many goldfish can I have in my tank?

I have a 320 liters tank and at the moment I have one tiny catfish (not much bigger that a tetra), a very little bristle nose, 10 small goldfish and one larger one. He measures about 6cm in length. ...
Eboni Gadd's user avatar
3 votes
1 answer
38 views

Goldfish constantly gulping but not eating

We are in the middle of a first time fish-in cycle (an aquarium gift from a well-meaning grandparent). We have a 2 inch Comet goldfish, who has been surviving the ordeal like a champ... until today. ...
user27577's user avatar
3 votes
1 answer
6k views

Common goldfish with "bleeding" around face, gills and fins

I look after two common goldfish in a 56L filtered tank with an airstone for additional aeration. Over the past two days, one of the fish has been appearing to be sick, suffering with what I can only ...
Thomas Russell's user avatar
3 votes
1 answer
241 views

Does a goldfish experience feelings of loneliness?

My goldfish has been the lone fish in her tank for a number of months now, and quite recently, has begin to behave differently and remain in one small area on the very bottom of her tank. Could ...
Sarah Weiss's user avatar
3 votes
4 answers
2k views

Goldfishes died first night

We bought 3 small goldfish from Walmart last night. We poured some tap water in the tank and waited for the chlorine to be released. After 2 hours, we put them in with their water (initially in the ...
Tina J's user avatar
  • 161
3 votes
2 answers
3k views

My little red eared turtle ate a dead gold fish should I be concerned?

This is my little red eared turtles image eating my pet gold fish which died of natural causes. Should I be worried? Is there anything I should do?
Vipul Vora's user avatar
3 votes
1 answer
11k views

Possible reasons goldfish hanging out near surface

We have two goldfish in an 18L tank, which has a pump filter and a light. We feed them lightly once a day and I change the water every week or so. We have had them for a few months and they have ...
Aryeh Leib Taurog's user avatar
3 votes
2 answers
814 views

Why are my goldfish acting this way, and how can I remedy it?

So I bought two goldfish on Wednesday, and the shopkeeper did not tell me to cycle the tank or anything. I bought the gravel and tree on Thursday and my auntie gave me an air pump and filter around ...
Claire Louise Bell's user avatar
3 votes
2 answers
492 views

White patch and spot on my goldfish?

One of my goldfish, which I've had for 3 months, suddenly got a white patch on the top and a white spot on its left side (the yellow-black one in the picture). I just noticed it today, but I'm sure it ...
Nicolas Hanout's user avatar
3 votes
1 answer
3k views

Should I euthanize my goldfish who has been floating for a month?

I have had my Oranda goldfish for three years now and he/she/it has been floating at the top of the tank upside down for the past month. The tank is a 40 gallon with 2 aqua-tech 40 gallon filters. ...
notchairs's user avatar
3 votes
1 answer
149 views

Goldfish (shubunkin) behaviour changes

I have a 20 gallon (76 liters) tank with 6 goldfish - all small sized. I have had this tank for around 6 months. I do weekly 50% water changes and feed them twice a day - mostly pellets and flake food....
Null Pointer's user avatar
3 votes
0 answers
65 views

How can I tell if my goldfishes' popeye is due to stunting or an infection?

I have three goldfish in a twenty-gallon tank. I know it's not the best set up and I would like to move them to a bigger tank when I get the opportunity, but they seem happy and healthy enough. I have ...
help_for_goldfish's user avatar
3 votes
0 answers
75 views

Is it safe to catch and move hibernating fish?

I have about 50 mixed types of goldfish and koi in an outdoor pond. I want to remodel the pond, expanding it to double the volume of water. I will relocate them temporarily to a 2000 gallon (7600 ...
Village's user avatar
  • 353
3 votes
0 answers
148 views

Goldfish skin around the intestine area is gone and stomach looks to be caved in

This is my first time posting so I’m sorry if I made any mistakes with my post. I think I’m going to lose one of my goldfish. About 2-3 weeks ago both of my goldfish (I only have 2) developed ammonia ...
Cece's user avatar
  • 31
2 votes
1 answer
2k views

Fish swimming with mouth always touching the water surface

I have a fish bowl and they are all swimming with their mouth touching the water surface, almost always. Are they hungry? Do they suffer from insufficient oxygen concentration in water? Is the water ...
Megidd's user avatar
  • 165
2 votes
3 answers
601 views

How can I keep my goldfish tank clean?

I'm tired of trying to get the scum marks and slime from the fish tank when doing a weekly clean, it looks gross so does anyone have any tips?
Claire's user avatar
  • 21