Dang I thought this was a saltwater website o well. From my saltwater experience a few pointers with the fresh water would to get a water pump for like 20 bucks to get better water flow in your tanks. Change the water often, that is the difference from a bad tank and a clean one. Do not overfeed, making a dirty tank. Get a clean up crew, like a cleaner fish or shrimp or something. Try and keep the temperatures constant not going up and down, up and down. overstocking is not cool.