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You might consider other types such as the octopus recirculating skimmers. While they don't hang on the back, they can be run externally without a sump with the aid of a close by shelf, or something...

Your tank is not suited for seahorses.

Your powerheads are not compatible, your fish are not compatible and some of your corals are not compatible.

Sorry.

For more info on seahorse safe...

I have kept them together for years without losses of peppermint shrimp. IME the emerald crabs are not a danger to peppermint shrimp. If the shrimp were fry, that could be a different story.

Sorry, the title of the thread and all the comments about seahorse safe hair algae eaters must have confused me. ;) :D

The seahare will clear a path but aren't really a solution unless you have a...

Lawnmower Blennies are not seahorse safe IME. Blue legged hermits are also more on the risky side, however a lawn mower blennie is capable of killing a seahorse. Often times seahores grow algae on...