09-06-2012, 08:20 PM
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Originally Posted by El Nandez
Okay, I have one Zebra Danio, 2 Rasbora, 5 neon's and 5 Rummy nose. There is no biting of the fins that I can notice, the only think I have noticed is that the Zebra chases the rummy nose's and the neon's which are smaller in size, it does not chase the Rasboras which are about it's size. The tank is a 35 gallon planted.
OK, first thing, zebra danio are shoaling fish which means they live in large groups in their habitat and they must have a group in the aquarium or they will be stressed. They are programmed to live in groups and normal behaviours within the group are often part of this. Stress can result in increased aggression. You should have no less than 6 of these fish. I'll come back to this.
The rasbora, neon tetra and brilliant Rummy nose tetra are the same, shoaling fish. The rasbora at two should definitely be increased to 6 or 7; I am assuming this is the Harlequin Rasbora. [Shaded names indicates this species is in our profile, click the name for the profile info.] While five for the neons and rummys is better than one or two, it would be a good idea to increase the rummys especially; this species always is better with larger numbers, say 9 or more. You have the space. The neons are OK, or you could add a couple, up to you. You can read the profile for more info on each species.
Now I'll come back to the zebra. If you increase the rasbora and rummys as i suggest, this is going to limit space. Rather than increase the zebra, I would suggest removing the one fish and re-home it. But if you really want this species, getting more might solve the chasing--or it might not. The stress of being alone might have caused this, and sometimes this alters the fish's behaviour and it does not change. It is something we can't predict accurately.