^^^ same reason I got mine. Although I had hoped my gobies would stay in the lower half of the tank and the chromis up closer to the middle/top. Thought it would fill the tank nice and even...of course my fish don't behave and ALL congregate in the middle/center of my tank ;)

So there is a huge school of 17 fish that crowd one area of the tank!

damselfish aka chomis are the direct relatives to cichlids and it is how both cichilds and chromis fight. doesnt mean one is going to die for certain but it is a fight for the pecking order none the less.

Good to know.

Well mine certainly are not going to be able to kill each other the way they were kissing earlier :D

I want them to do it again for a picture but they won't do it for the camera!

mine have done the same thing but they dont kill each other its like deers or rams bumping heads to see who is stongest. in some cases it may lead to outcasting but not always.

yeah I have heard of clowns doing the same and they can screw up each others jaws like that, leading to dislocated or locked jaws... or just a fish being generally beat to death or submission. Hopefully just submission, but personally, I hear of more death than I do success with chromis groups of any size greater than one.

There was a thread on RC about chromis groups and it was maybe about 60-40 but certainly more death. Seems once down around 3 it works ok. We'll see. So far so good. Just the one incident of jaw fighting so far. I expect more eventually though.

I love chromis, great cheap little fish. I have found that 3 at the same time really is that magic number. I've tried 6, 12 and 15 at different times but the final number after a month or so always goes back down to three.