aggressive goldfish and shark?

valkyrie-mate

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Nov 27, 2010
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I'm new to semi-aggressive fish and I'm not sure how they should be kept. I have a goldfish that is aggressive. He's not that big but he killed the two other goldfish that were brought home with him. He also killed my friend's goldfish Derrell who was almost twice the size of my fish. The tank has always stayed around 72 degrees(that's without a heater heating it) so I put a adjustable heater in it and set it to that temp. I always put heaters in and set them because our house heat has a tendency to go out and I've lost entire tanks. I know 72 is warm but I moved the tank around the house(which stressed the fish bad) to try to find somewhere it didn't get so warm and I tried putting ice cubes in it but that also stressed fish. Plus I have to buy ice(well water not good) and it was very expensive and the fish seemed fine in the warm water so I quit trying to keep it cool and just fixed it to where it stayed 72. I was going to try to find someone to adopt the goldfish because it's a 100 gal and I wanted to put more goldfish in when someone on a forum suggested I get a semi-aggressive fish since my goldfish is so aggressive. The tank is over filtered(like a goldfish tank should be) so I decided to give it a try. I got a baby albino rainbow shark. The fish get along great. My only thing is can I get other fish? If so, what kind would go with evil goldfish and shark? DO I have to just keep them and only them? Any advice on where to go from here would be great. My plan is to get a bigger tank and move them to it so there will be more room for other fish but what other fish can I get?
 
Goldfish are social, they like to be with other goldfish. Its weird yours is so aggressive. Were the goldfish it killed smaller than him? What kind were they? When fish are stressed they can become aggressive, so maybe thats why.

I would introduce several goldfish to him. Same type and larger than he is and see how he acts towards them. Maybe in a group he won't be so aggressive and they would develop a pecking order.

Don't worry about the temp, 72 is fine.
 
All the fish are/were comets. One was slightly larger and one was the same size as him. Derrell was 5 inches. My fish, named Cupid,(named him that before I saw his personality) is only 1&1/2 inches. Larger fish was 2 inches so not much bigger. The same size fish died first. His fins were torn up but the 2 inch(named tiger) had torn fins too so I thought they had got into it and Tiger was the killer but then Cupid started attacking Tiger ans killed him. My friend(Derrell's mom) was going to take my fish after they cycled the tank so I could get telescope goldfish because I read comets had to be kept only with comets and that's what my friend has. I will try the larger goldfish again(not my friends. She still misses Derrell) and try that. How many do you think I should get? What about the shark. He's smaller than the goldfish. I'm actually a little worried about him. They seem like they're getting along great but the goldfish is growing fast and the shark is smaller than him. I read aggressive fish get more aggressive with size(I don't know if that applies to what should be a gentle fish) and I don't know how fast the shark grows whether he can keep growing speed with Cupid or if he'll become a target because of his size. This entire thing sounds so crazy (I feel crazy just writing it) but I have no clue what to do.
 
I also have a baby (but bigger than Cupid and albino) regular rainbow fish that was aggressive toward both goldfish and albino. The albino ran and hid from rainbow but Cupid got aggressive back and nipped some of rainbows fins so I took rainbow out of tank and put him in holding until I can get him back to the store( don't know anyone around here who'll take him but I know Petco will take him and adopt him out to someone). should I try putting rainbow back in? I took him out because there was obvious fighting and the albino was terrified but maybe he'd put Cupid in line?
 
don't put the two sharks in the same tank. they tend to be aggressive towards others of their own kind and it is advisable to only have one per tank.
 
I was thinking of giving Cupid to one of my nephews. He's been wanting one for a while, as long as his moms okay with it. I hate giving up on the fish but now he's started chasing the shark. The shark hides, comes out, cupid goes after him, then the shark hides again. I'm beginning to think he's not a goldfish. lol. My original plan for the tank was to get fancy goldfish. Maybe a black moor. If I re-home cupid, could I still get the fish I originally wanted or will the shark cause problems? He is very small and even baby fancy goldfish would be much bigger than him. My cousin bought me a baby fantail. He just moved down here and didn't know about cupid being so mean. I want to put him in the tank but I'm afraid cupid will attack him. Should I try it or wait till my nephew takes cupid and then put new fish in? Sorry this is all so long. I just have no idea how to deal with aggressive goldfish. Do the rules of aggressive fish apply to him even though he's a goldfish?
 
How many do you think I should get?

With most fish you'd get at least 5 to spread aggression. But comets would eventually need a pond... I think it would be best to put him in a pond with bigger goldies (none big enough to eat him though).

The shark is tropical so he likes around 76-78F and he will likely bully fancy goldfish. Sharks are very aggressive and fancies are delicate.
 
My nephew can take cupid so I'm going to give him to him. He going to his new home tomorrow morning. I pray I never get another fish so mean again. I definitely won't be setting up an aggressive tank.lol. The poor shark has lost some fin thanks to cupid attacking him. Is there anything I should get to help him grow them back or he should be fine without meds.? He may become aggressive as he gets older but right now he's just a victim.
 
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