I've got 5 nessarius and 1 mexican turbo snail in my 40b right now but the algae is starting to overtake the walls and glass. I'm evidently short on snails here but wanted to make sure i P/u the right ones to do the job. anyone got any suggestions. I went to look for some astrea snails but Ost was out and exotic was closed. If you got some for sale, let me know. Thanks