Green bubble macroalgae is the easy to remove by hand, it feels like plastic, and you won't pop the bubbles as long as you get them before they are going transparent. I personally like the macro, I think it looks like marbles... and like all macroalgae, it will keep your water parameters pristine. It absorbs phosphates and nitrates from the system, as well as ammonia and nitrites if you had a spike, as you remove the bubbles when they get to be too many, you export all the nasty stuff out of your water system.
I have not read that Sally Lightfoot crabs eat green bubble algae (doesn't mean it isn't so, I just didn't know it), I know they eat regular algae off the rocks. The emerald crabs eat green bubble algae, but remember they feed on it, therefore when they poop, they release the phosphates and nitrates back into your water system. They also break open the bubble as they feed and release the spores.
