When I researched Dwarf Rainbows before I purchased them I was tiikd they were a schiooling fish but could be kept in groups of 3-5 if they were the same sex they would school withother fish.
I purchased 4 males and added them to my community tank I was told they are a peaceful fish.
All was fine and they started to grow I was also told that there would be a alpha fish who would hae lots of color and then the others would work out who would be next in order and then the others would have less color but they all seemed the same color with one a larger one and they didn't really school that often
a week and a half ago I found one dead with its tail eaten. My tank is fine with no disease I have my temp warm and have a uv sterilizer and no new fish in a long time in my tank.
I went to my LFS and asked I was told sometimes they might pick on the weaker one, I was thinking of buying 3 more to make a school but they only had small females.
I noticed that the 3 are being agressive with each other now today one was in the corner and when it came down there was hours of them stalking each other.
If I purchase more and they are smaller will they kill them off? If I have 3 males and purchase 3 more what sex should they be? Will my 3 settle down? they were fine again later in the evening or will they keep killing each other off?