Ok so I have had some zoa and paly frags that have been growing out for close to if not 2 months now and have grown nicely. The only reason they arent for sale yet is because the 1 place aside from on my glass that algae likes to grow is on my frags. Not even the mother colony but only the frag plugs. Does anybody have any tips on how to remove this? and more importantly on how to keep it from growing back, or occuring on future frags?