freshwater tank

Hello, so I've had my Green Terror for almost a year now and he's up to about 4.5 inches. Been very healthy since I've had him. Only recently has he been acting very slow and almost like he's weak and is always just laying low under things in my tank. His usual behavior is pretty energetic and...

Recently I've moved back into my dorm with my 10 gal tank of dace and darters. 3 rainbow darters, 2 fantail, and 4 blacknose dace and 2 s. redbelly. Before they came home with me everyone got along well, and my dad said everything was fine when they were with him. They did go through a...