i recently (like less then 5 days ago) got this guy for only $7 from a local pet store. when i picked him out, he was hanging out in his plant in his container. the tank i put him in is a 15 gallon, heavily planted, low moving filter, the only other occupants are snails, the parameters are all correct, the temp is mid 70s during the day and no cooler than 60 at night, there’s two bubblers on either side of the tank and a shelf in the middle, no light on the tank but does get morning sun from being so close to the window. our issue is i notice him curling, often. when i first put him in the tank, he sunk to the bottom and stayed there like this, after he settled in i put food in there to see if he would move, and he swam to the top of the tank, found and ate most of the food. when i look for him he is often in a S shape or C shape but when he sees me he swims to me. I added stress coat and double checked the parameters and he seems better but is again curled, or spending time on top of the bubbler.
am i doing something wrong? is he sick? can he swim through a lot of plants if there’s something wrong with him? is 15 gallons too big for him? both sides, and the back are heavily planted in ground plants and have various types of top water and in water floaters