like the title says they were with 2 marbled crayfish (sine taken out) 1 size of shrimp and other 3 times the size and a crown tail betta. no sign of why who did it.
i'm a little confused, so do you mean now your crayfish and beta have now been removed from the tank... and you went from 12 Cherry Red Shrimp to 2 or 3 left? with one berried?