Soon I will be shopping for a cleanup crew for my 10 gal, 18 lbs fiji LR, 3"DSB tank. What snails/crabs should I be looking for, and how many per gallon? My initial idea is 6 astreas, 2 turbos, 2 blue leg hermits, and a skunk cleaner. Could I add 2 peppermint or blood shrimp as well? The...