Nassarius snails are great at detritus, uneaten food, and fish waste. They climb the glass as well as burrow in the sandbed and oxidize it, so one of the best snails to get, I would get a few more. Some people say "one cleaner per gallon of water", but you might have to worry about them starving if its a new tank, or other complications, i would add maybe 10 more though, to give you 15 for your 26 gallon. If not them, peppermint shrimp or scarlet hermit crabs are great scavengers, they look cool moving around your tank, etc too. That's my .02.