[Dearth]

Emerald crabs are IMO a waste of time plus they generally will only eat bubble Algae only if nothing else is to be had plus they are known to kill other crabs, snails and small shrimp

I've had bubble algae in my tank for 4 years now I do manual removal which keeps it in check however it is very unlikely that it will be eradicated

I used vibrant twice and both times bubble algae came back with a vengeance so I am not a fan of it

personally I would manually remove what you can and if able remove rocks and scrub them and do it when you change your water. You most likely won't be rid of the algae but it will be manageable