I have about 3 inches of c.c. on the bottom of my 29 gallon tank. When I started to get the unsightly brown algae I got trochus snails and hermit crabs. 1 snail per 10 gallons and I have now idea how many hermits. I have 3 snails, 4 blue hermits, 4 red hermits, 1 cleaner shrimp, emerald...