shipped notho in trouble

Hello Everybody, I've got a problem. I received a few pairs of N.rubripinnis in the mail yesterday. Unfortunately, 1 of the males arrived dead, and the other is not doing so well. He is on his side, trying to keep his head up, and still breathing. He did make it through the night though. The females are fine, no probs. Does anyone know of anything I can do, to try to bring him around? I matched the ph of the water they were in, and aclimated very slowly (probably why he is still alive), and increased the air. Anything else I can do? They're nice fish and I'd really like to save him. Another larger pair of N.fuscotaeniatus shipped in the same box, is also doing well. I wonder why just the male Rub's were affected. Thanks, Ron