Hi all, I recently bought 3 new red dwarf gouramis and a blue one along with 2 peppered cories and 2 bronze cories. The peppered cories died almost str8 away, which I put down to a bad batch. More recently tho, a week later my 3 red gouramis all showed signs of what looked like wounds on their side. I was going to try an find this out today but woke this morning to find the 3 of them dead. The two new cories seem fine and the rest of the fish seem fine exept for my rainbow shark which now has what looks like a large cut on his side (the same as the gouramis). Can anyone help with what this might be.