My new fantails seem to be eating eachother....
I have just set up a new tank with two fantails (I think) could be oranda... thats what it said on the tank. 20 litre tank with under gravel filter and light. They have been in for less than a week and one of them is taking nips at the other. the four fins along the bottom of the fish are now quite badly frayed and he is starting to be inhibited swimming. What can I do to stop this happening?