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`

Filter by
Sorted by
Tagged with
0 votes
1 answer
74 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, ...
user avatar
  • 167
0 votes
1 answer
94 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?
user avatar
  • 103
0 votes
0 answers
50 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 ...
user avatar
  • 167
3 votes
1 answer
1k 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 ...
user avatar
4 votes
1 answer
129 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 ...
user avatar
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 ...
user avatar
1 vote
0 answers
45 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?
user avatar
2 votes
1 answer
432 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 ...
user avatar
3 votes
1 answer
162 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 ...
user avatar
  • 353
1 vote
1 answer
95 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 ...
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 ...
user avatar
0 votes
1 answer
115 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.
user avatar
1 vote
1 answer
76 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?
user avatar
1 vote
1 answer
140 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.
user avatar
1 vote
2 answers
144 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. ...
user avatar
1 vote
1 answer
315 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.
user avatar
5 votes
1 answer
126 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 ...
user avatar
4 votes
1 answer
105 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 ...
user avatar
2 votes
1 answer
198 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 ...
user avatar
  • 31
1 vote
1 answer
33 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 ...
user avatar
  • 353
3 votes
0 answers
50 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 ...
user avatar
  • 353
3 votes
0 answers
100 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 ...
user avatar
  • 31
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 ...
user avatar
2 votes
0 answers
26 views

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 ...
user avatar
1 vote
1 answer
186 views

How to prevent snakes from eating goldfish in pond?

Some snake found its way into my pond. I heard that local snakes will eat the fish. The pond is 1/2 underground and 1/2 above ground with a 2 ft high brick wall all the way around. Is there some ...
user avatar
  • 353
3 votes
2 answers
111 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 ...
user avatar
  • 138
0 votes
0 answers
38 views

Reliable way of giving away goldfish [duplicate]

About a year ago i built a small pond with 5 goldfish inside. Apparently they really liked it because they started reproducing a lot and now there are more than 15 and i'm guessing that the space they ...
user avatar
  • 138
2 votes
1 answer
88 views

Goldfish with intermittent swim bladder problems

I have an 11 year old common goldfish and he has recently been having some swimming issues-but only in deep water after a few hours. He is fine in shallow water and he can swim fine for about 8-9 ...
user avatar
  • 91
1 vote
0 answers
36 views

White bumps on goldfish

I have 2 goldfish in a 20 gallon (76 liters) tank and last night I noticed one of them developed a white bump on its side, then this morning I noticed the other one has a similar white bump on its ...
user avatar
2 votes
1 answer
205 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 ...
user avatar
  • 353
3 votes
1 answer
691 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. ...
user avatar
5 votes
1 answer
55 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 ...
user avatar
  • 153
0 votes
2 answers
258 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 ...
user avatar
3 votes
2 answers
711 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 ...
user avatar
  • 161
1 vote
2 answers
893 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 ...
user avatar
0 votes
0 answers
61 views

My empty but not empty fish tank

My Betta died a couple weeks ago so now i have a tank filled with water, can my small female goldfish be in the small rectangular container that has rocks a cave and a sea anemone, and this tank has ...
user avatar
3 votes
2 answers
1k 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 ...
user avatar
  • 141
3 votes
1 answer
1k 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 ...
user avatar
0 votes
0 answers
265 views

Why did all my goldfish suddenly die?

I have read this question, and this one, about goldfish/pond life suddenly dying. These situations are similar, but not identical to my own, and so I'm not sure whether this question is a duplicate. ...
user avatar
  • 109
1 vote
1 answer
4k views

My goldfish's entire wen is gone, please help me!

So 2 days ago we cleaned the tank, all fish were fine. It took 24 hours for the water to clear up and all the fish were still fine, but I noticed a piece of fish poop stuck to the head of my baby ...
user avatar
4 votes
2 answers
5k 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 ...
user avatar
  • 91
1 vote
0 answers
208 views

Goldfish laying at an arch- what should I do? [duplicate]

I have one common goldfish in a 20 gallon tank with a filter and heater. She has been sitting in this arch position for about 4 hours with little to no improvement (couple of little energy bursts). I ...
user avatar
  • 11
14 votes
1 answer
4k 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 ...
user avatar
  • 141
4 votes
1 answer
138 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 ...
user avatar
3 votes
1 answer
534 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 ...
user avatar
  • 31
-2 votes
1 answer
90 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 ...
user avatar
1 vote
1 answer
95 views

Is it safe to add medication in a fish tank if there is no sick* fishes? [duplicate]

My water conditions aren't the best, yet, my fishes are doing their best so far. I want to put a fungus and fin rot remedy in the fish tank but none of them have it (at least I don't think so). Two-...
user avatar
  • 11
3 votes
3 answers
1k 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....
user avatar
  • 133
1 vote
0 answers
60 views

What is that white spot on my goldfish? [duplicate]

Its been like a few days since it showed up, how do i treat it, Im tight on budget, also my red fish passed away today, and yesterdaay i bought this aquarium with filter, the capacity was 6l on old ...
user avatar
3 votes
1 answer
226 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 ...
user avatar