Talk about being a [HASHTAG]#crabhater[/HASHTAG]I say one is too many. I've learned never to trust a crab the hard way. Ie. knocking over rock work, moving frags, and hunting fish at night. But if you want an emerald, I think 2 would have been plenty.
I so far just think a good mix of everything just like nature has is best. I had problems with blue leg hermits. They were eating all my snails. But yah I have 4 types of snails. Red leg cortez crabs and now emerald crabs. I also have 2 peppermint shrimp and a skunk cleaner shrimp. They all can do things to corals if not fed properly.
He probably leans twords snails. Problem I've had with my snails is they get big and than don't clean my rocks. Most of mine all just hang out on my back wall.
Good luck catching them.
BTW, the best snails are Trochus, Nassarious, Astrea (I prefer the spiny kind, but can be hard to find), and Turbo (Chestnut is a smaller option for Turbo).
Nerites don't live in the water all the time, that's why they are always trying to leave.
Margaritas don't come from warm enough climates. They will have a supercharged metabolism for a few months then die.
Ceriths are OK, nothing great IMO. Dwarf Ceriths are terrible because they are too small to tell if they are alive or dead (and usually when you order any, the retailer will throw in way too many)
If your snails are attracted to the back glass then clean it to force them to look for algae on the rocks.
Talk about being a [HASHTAG]#crabhater[/HASHTAG]
Only joking! I've heard good and bad things but what else will get rid of tough algae other than crabs?