Few Various Questions.

Morquinn

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We recently bought a silver dollar and tinfoil barb, and they were the best of friends. They were very small when we got them and unfortunatly our clawed frog got the best of the barb. Now our silverdollar is lonely, is getting one more a good thing to do? I'd rather not have a bunch, since I already have black finned sharks and other fishes taking up space in the 55g.
Another question is we got some fish from a relative, one being a giant danio, he is very aggressive, specially towards the silver dollar and blind cavefish and wont let them on "his" side of the tank. I do not know if the danio is male or female, but what I do know, that I just noticed recently, is towards the night time, he gets a beautiful redish/orange color lining his stomach all the way to his tail, but it goes away during the day, what is this? Actually I dont even think it goes all the way down his stomach, I think it starts half way, by the anal fin? By the way, the silver dollar is bigger than the giant danio, yet, he still gets picked on. I have a friend that works at the only petstore here, and has never seen nor heard of a giant danio, so getting him a mate would be out of the question unless I wanted to drive a ways.
 
We recently bought a silver dollar and tinfoil barb, and they were the best of friends. They were very small when we got them and unfortunatly our clawed frog got the best of the barb. Now our silverdollar is lonely, is getting one more a good thing to do? I'd rather not have a bunch, since I already have black finned sharks and other fishes taking up space in the 55g.
Another question is we got some fish from a relative, one being a giant danio, he is very aggressive, specially towards the silver dollar and blind cavefish and wont let them on "his" side of the tank. I do not know if the danio is male or female, but what I do know, that I just noticed recently, is towards the night time, he gets a beautiful redish/orange color lining his stomach all the way to his tail, but it goes away during the day, what is this? Actually I dont even think it goes all the way down his stomach, I think it starts half way, by the anal fin? By the way, the silver dollar is bigger than the giant danio, yet, he still gets picked on. I have a friend that works at the only petstore here, and has never seen nor heard of a giant danio, so getting him a mate would be out of the question unless I wanted to drive a ways.

No doubt the reason for your danio's aggressiveness is that he is a schooling fish. They really do need to be in schools of at least 6-8. They work hard on establishing a hierarchy within the group, but as long as the group is large enough and they have plenty of space, this is usually not too traumatic. But your fish is in a situation where he can't find a natural outlet for his instincts- yet he is only a fish, he can't decide to switch his instincts off. If you can find somebody who keeps giant danios, that would be the kindest option for everybody concerned.

Incidentally, silverdollars are also schooling fish and should be kept in groups. And so, I believe, are tinfoil barbs. Pairs do not always work well with schooling fish as there is only one fish for the alpha fish to pick on all the time.
 
Yup all the fish you mention should be in groups of 6+, if you don't have room for big enough groups of them all, perhaps think about rehoming some of them.

Emma -_-
 
Could I fit possibly 4 of each in a 55 gallon? That is what they are in. Im not going to be purchasing another tinfoil barb, although I really liked the one I had. I really like the giant danios, so maybe I will get some more, but I have to find a petstore that sells them. The one up in my town doesnt, that means an hour drive south. We got him from a relative, and I didnt even know danios got that big, till I heard what kind he was. So, will 4 of each be ok? Or should six or more really be the minimum?
 

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