I have 360 gallon freshwater aquarium with an 80 gallon custom aquarium sump seems that I have real tiny snails. I see them in the sump and sometimes in the tank and the glass. They’re very very small and I’m wondering what to get rid of them I have a a large stingray in there roughly 14 inches and a arowana that’s all. Ray roughly 14 “ inches and arowana about 20” that’s all any help would be appreciated. 50% water changes seem to help. I only feed them raw shrimp and they get 1 1/2 each, so I don’t think I’m overfeeding them. Water paramogood. Any thoughts? Thanks, Larry