Golden Gourami feeler damage

[tboothby]

It was the shark. I had never seen him acting that way before, usually he just stick to his territory, but when I got home today he was attacking all my mid to top swimming fish.

I have him in a little 10 g tank now, but I don't know what I'll do with him. He will get to big for the 10g tank and I don't have room for a second big tank.

Probably try to find somebody that can provide a suitable environment for him.

 

[OrionGirl]

Behavior changes as fish mature. Not as noticeable with schooling fish, but for fish that are considered 'solitary', becoming territorial is usually the main reason. For some, they just need to be kept away from conspecifics, others it's based on size.

Some will be jerks to anything that goes in with them.