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I wouldn’t put a spider decorator in there, maybe a smaller species. The others should be fine just make sure your rock scape has lots of hiding places for them.
Not necessarily, but they are a rather large crab and it might compete with other crabs for rock space. Keep in mind decorator crabs are best for established systems as they like to frag soft corals and the likes to use as camouflage. I would wait until you have established colonies so that the occasional fragging wouldn't bother them much. If your corals are not grown out the decorator crab might just end up killing them.
Yes, I would wait a full year or so for your corals to grow out. What kind of corals do you have?
I do not have any corals yet, I actually don’t have anything yet my tank is still cycling lol. I was just trying to get an idea of what I was putting in the tank. But I do plan to get corals. Any suggestions would be greatly appreciated.
Oh yeah, sorry forgot you didn't have any yet. Decorator crabs like to frag soft corals (primarilly mushrooms, zoas, and leathers). Soft corals are very easy and forgiving and only need low light to grow and they grow relatively fast. You don't need to worry about the Decorator crab going after other corals too much. Just wait until you have large soft corals that won't mind having a few chunks taken out of them.
Noopschyce k7 or an Ai prime 16 would work great.
Yes, dont think you'd have an issue with them. Emerald crabs are scavengers while porcelain crabs and pom pom crabs mainly filter feed. Pom pom crabs use their anemones to grab particulates out of the water column and porcelain crabs use their fan-like appendages to do the same. There shouldn't be any competition between them.
