(55-gallon tank with fake plants, 4 zebra danios, 1 giant danio, 1 angelfish, 1 male swordtail, 1 female betta, 3 neon tetras, and 1 cory cat. Water parameters were all perfect with a Ph of 8.0.)
I got a young-ish red-eyed tetra from a friend. I also got a cory cat and a zebra danio at the same time. The danio and cory have adjusted well, but the tetra is hovering against the back of the tank and is not eating. He was healthy and happy in the friend's tank (as far as I know, anyway). Any thoughts as to what is wrong? I will be getting three more red-eyes from her next week, so I am not sure if he is just missing his schooling buddies or not.
Water parameters should all be good - no ammonia, no nitrite, low nitrate - although I have not checked them again this morning. I drip-acclimated all three new fish, and my high ph matched the friend's tank water almost exactly. I hesitate to put him in a hospital tank since I have tried this with other fish and it seems to stress them out even more.
A final comment - this particular fish has a very odd body shape. Instead of having an even profile from tail to top to mouth to stomach, he's kind of "lumpy" looking. He's symmetrical side-to-side, but he's just not a "show" specimen. He looks kind of squashed between his dorsal fin and stomach. I don't know if this has anything to do with his behavior or not. Unfortunately I cannot capture a photo.