I have a pair of thick skins (male and female). Both of them approx. 3-4" long. I just bought them a few weeks ago. Since then, the male has been very aggressive towards the female, forcing he female to hang in the top corners of the tank and not very active, not eating much either. From what I know, the male is mormally very aggressive, and probably claimed the whole tank (29 gal) as his.
Just a few days ago, I introduced a pair of african cichlids (unknown type and sex at this time), approx. 2" long, and since then, the female thick skin has been swimming around, eating more, very active.
Now, the male Thick Skin isn't very active, not eating, not swimming. Its just hanging out at the upper portion of the tank, mostly at the surface, sometimes vertically (not gasping for air). I noticed that when he does try to swim, he is just using his left fin. All other fins are tucked and closed. Right now, he is just drifting around in the tank, to where ever the current takes him. I dont see any infection on his body. He is just very pale, and not swimming.
I dont know what to do. Any suggestions?