I picked up a couple of Ceriths that happened to be in the hermit crab tank at the LFS. They seem to work well, but of course 2 Ceriths won't cut it in the 46 gallon. I have no idea why they don't have Ceriths for sale aside from the couple that came with their hermit crab shipment. I also got a lawnmower blenny. So far he has left my macros alone and is picking at the hair algae for sure. I also got some more hermits and a brittle star. Hopefully I can cut down the nutrients in the system at least, and the lawn mower should be able to eat for a while.