I think everyone established that there is a threesome and theres a lone man out. What they are suggesting is you remove the less dominant/big female and place her in with the beaten up male, so put in a tank divider and have a pair on either side. They will probably pair up, then youll be able to remove the divider after they have established a partnership.
Netted him back out and put him back in the con tank. He played nicely and I had fry 2 weeks later 