My Damsel's Strange Behavior
I have two damsels in my tank. They have been in there for about 2 weeks now. They were doing ok until yesterday. One of them was going along fine, swimming, eating, having a splendid time (or so it seemed) and the other one was pointing straight up and was usually at the top but sometimes it would slide down a little bit. Its nose is just pointed straight up at the top and 75% of the time its right at the surface. It keeps wiggling side-to-side but no other movement for the most part. My other damsel sometimes approachs it and kinda chases it around for a little bit but then gets bored and goes and does its own thing. When I feed them they usually both come and fight over the flakes but now only the active one comes to the top and I haven't spotted the other eating (it is possible it eats but I haven't witnessed it). Right before it started this unusual behaviour, it was being closely chased by the other one. Every now and then, the active one approaches it and either tries to get it to move around or just watches it for a second and then swims off. I have no idea what's going on so if I can get some help here, I would very much appreciate it.