how many of what should I have for a ten gallon fowlr. I have 5 astreas and 14 hermits. i realize thats too many lol but how many turbos, ceriths, and nassarius and crabs should I have ?? i was thinking like 6 crabs, 3 turbos 5 nassarius(small ones) and 3 or 4 ceriths. I get the ceriths and the nassarius confused so... im thinking the ceriths are bigger right? i also have have 2 brittle stars(hitchikers)and a pistol shrimp...REDICULOUSLY small