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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1 answer
1k views

Why my goldfish red cap lost its head color?

Is it normal that the color fading away..? The water seems fine. Food : Tetra Goldfish Growth and other pellet. It's been 2 months with me.
0 votes
1 answer
89 views

Whats wrong with my fish?

Not sure what’s wrong with my fish. Got this fish about 3 years ago. Always been fine, in a small tank. Moved him in to a 50 gallon tank, and randomly( few months in ) grows a big ball on his head ...
5 votes
2 answers
13k 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 ...
1 vote
0 answers
37 views

Why does my goldfish have red under their chin, like a graze?

I've been lumped with caring for the office goldfish tank. Trying to do my best, I've cared for tropicals before. One of the goldfish in the tank, my favourite, has recently started developing a ...
0 votes
0 answers
23 views

What is the whitish bump on fishes head?

There’s a weird bump on my gold fishes face. I don’t know if it’s a parasite or from him bumping his head on the ride home
0 votes
0 answers
42 views

Is this an injury or a disease?? I just got the goldfish

Its been swimming around a lot maybe it hit the tank?
2 votes
1 answer
710 views

Wound on the head of my goldfish

I had two gold fishes and a few days ago I noticed my other fish was sitting at the bottom of his tank and struggling to to get to the top (swimming to the top and automatically sinking down). I had ...
0 votes
0 answers
30 views

Goldfish problem

Hey guys any idea what’s wrong with this poor guy he’s acting pretty normal but he has this big red spot/bump between his eyes and he has brown around some of the white on him. The white and the ...
2 votes
1 answer
202 views

Can goldfish eat sea lettuce?

I picked up some sea lettuce attached to stones from the local beach near where fresh water was entering the sea, and have washed off the salt water, and placed it into my fresh water tank. The leaves ...
2 votes
2 answers
2k views

Why are my fish always scared?

I have a tank with four 1.5" Shubunkins, which I've had for one month. There are no other fish. It is a glass-bottom tank with no substrate (for easy cleaning), and has many floating plants for them ...
17 votes
4 answers
12k 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 ...
2 votes
1 answer
96 views

Goldfish breeding behavior?

I have an outdoor pond that has 6 large (10+ inch nose to tail) goldfish in it. These are fish that were originally bought as pet store feeder-type fish, so they're nothing special. I have a webcam ...
3 votes
2 answers
427 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 ...
0 votes
1 answer
253 views

Why putting Peas in the Fish Tank to feed fishes clouds the fish water?

I have a 30 gallon fish tank and the water was very crystal clean when I feed my fishes ONLY their fish flakes and pellets. As soon as I threw bunch of boiled, skinned, washed peas into my fish tank, ...
0 votes
1 answer
321 views

Fish bent spine

My black moor get sucking in my aquarium siphon durning water change. Is there any medicine or treatment to follow to straighten the fish's back/spine?
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 ...
0 votes
2 answers
463 views

What is this gray blob that suddenly appeared in my aquarium?

This blob of gray stuff has suddenly appeared in my 10 gallon aquarium where my kids' comet goldfish has been happily living for 6 months. I've also started to see some green algae form along the ...
0 votes
1 answer
193 views

Will every goldfish never stop growing?

I'm confused whether goldfish will never stop growing or not, how much will its genetics affect its size? I want to buy a high quality goldfish, not a bad one.
0 votes
0 answers
91 views

Do I have to take my Koi Fish out of my 30 Gallon Tank eventually?

I accidentally bought a Koi fish thinking it was just a normal goldfish. After about 4 years now, he has gotten bigger (mouth to tail ~ 7 inches long) and more aggressive in our 30 gallon aquarium. He ...
5 votes
1 answer
482 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 ...
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 ...
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?
-2 votes
1 answer
100 views

I have a thirty gallon tank with seven fancy goldfish

I have a thirty gallon goldfish tank with seven goldfish in it. Is this overstocked? All but two of the goldfish seem healthy, with one sometimes bottom sitting and the other with black marks that I ...
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 ...
3 votes
1 answer
5k 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 ...
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. ...
4 votes
1 answer
238 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 ...
3 votes
1 answer
280 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 ...
1 vote
0 answers
1k views

Lump on Goldfish

Several months ago my red cap oranda developed a lump on his side. It resembled an acne nodule. The lump was beneath his scales and didn't seem to cause him any trouble. He had some mild red streaking ...
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 ...
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 (...
1 vote
0 answers
128 views

What is wrong with my goldfish's head?

What is wrong with my goldfish's head - it's like a growth/ blood blister? I'm sure it started off white and has now gone to this. Can anyone help, please?
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 ...
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....
1 vote
1 answer
180 views

How to increase goldfish color?

I was fooled a bit when buying this one fish, when the fish arrived it looks not so appealing to me... is there something I could do to brighten it's color or should I just ask for a bit refund? I ...
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 ...
1 vote
2 answers
255 views

Why is my oranda goldfish gasping at the surface?

I have 110 gallon (420 liter) tank, which contains 1 ranchu measuring 13 cm, 1 ranchu measuring 10 cm, and 1 oranda measuring 8 cm. The oranda is gasping for air, while the other fish seem fine. ...
1 vote
1 answer
124 views

My goldfish doesn't like bloodworm

I bought a cup of live bloodworm, but surprisingly my 13 cm ranchu doesn't eat it, but my 10 cm ranchu likes it. How to make my 13 cm ranchu eat it?
1 vote
1 answer
464 views

Can I feed my goldfish my red cherry shrimp?

I have many low grade cherry shrimps. Can I feed them to my goldfish? Low grade is instead of bright red, the color is fade red or transparent.
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 ...
5 votes
1 answer
221 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 ...
1 vote
2 answers
2k 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 ...
1 vote
1 answer
50 views

What setup will allow koi and slow goldfish to live together?

Some people have told me I'm not supposed to keep koi with goldfish. The reason I've heard is that the slower fish can't get food. Unfortunately, we had an issue with one of the ponds/waterfalls ...
3 votes
0 answers
74 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 ...
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 ...
2 votes
1 answer
552 views

Will shubunkin and other fancy goldfish eat smaller fish in a pond?

I am building a 20,000 gallon (76,000 liters) backyard pond for some shubunkins and other fancy goldfish that have outgrown their aquarium. Our climate is such that the pond will only freeze ...
3 votes
0 answers
145 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 ...
0 votes
0 answers
87 views

What should I do to my goldfish swimming on surface? [duplicate]

I am new to goldfish, it is swimming on surface like gasping for air every 3 minutes or so. So, I did 40% water change, using drinking water just now. Should I do something else? There is 24/7 filter ...
2 votes
1 answer
1k views

Fantail goldfish looks bloated - Does this mean he is sick?

I bought two goldfish last summer and they've been doing great in my 10 gallon tank, but I am starting to wonder about one of the goldfish. I don't know if he is sick, in pain or what. When I bought ...
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 ...