started a 10 gallon tank few months ago with 2 very small wonder golden killifish 5 neons and 2 rosy Tetras. The bigger male was attacking the smaller KillI so I removed the small one and put him in his own tank. About a week ago I noticed the big KillI needed more room and got a 20g. The KillI has never had a problem with any of the Tetras which are 1/3-1/2 his size. Today the wife and I went and got 2 dwarf gouramis and 3 LF zebra danios. The danios are little bit bigger than the Tetras but the KillI seems to have a problem with them chasing them everywhere. Have since moved the big KillI to his own tank and the small KillI to the 20g. What is going on and will more plants and decor help calm him down due to the less visibility and direct line of sight?! Please help!!!!