bubble algae remedy

[props]

saw a few of these sprouting in the tank. 8-10 to be exact well the ones i could see anyways .. has anyone tried an emerald crab and had success on getting rid of them??
thanks
also i just read this
"If this algae grows in your tank it also indicates you have good water quality. This algae can be bad when it starts to spread over other corals and suffocate them. The bubbles sometimes give a nice look to the aquarium but in large quantities it can be bad"
if i have a good quality of water why are they growing now? and where from? =o/