I wanted to get a new cleanup crew going in my tank, I lost all my snails when I moved the tank a couple months back. Currently I only have a cleaner shrimp and want to add a peppermint shrimp (to clean up possible aiptasia, I've manually removed 3 now) and an emerald crab (to cleanup bubble algae). I wanted to also add some sort of hermit crab and more snails of course. Currently I have a crushed coral substrate but may be converting it to sand in the next couple months. Any suggestions on what type and any compatibility concerns?