4 of my 6 Cory's have been wacked out and I just don't get it, 3 of them were fine yesterday, they mind their business but they are the only ones. It is either the large male Odessa or my 2 Rainbow sharks, I feel bad because I have 2 Cory's left but no other tank t put them in. Any suggestions. Someone had also took out my female cherry barb but I cannot remember if it was before or after the Rainbow sharks came along.

My tank consists of

6 Odessas
25 Neons tetras
6 Denison barbs
1 Cherry barb
2 Rainbow sharks
and the 2 Cory's that are left :-(