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ID and Friend or Foe determination

Me again..... I have noticed the growth of what seems to be some type of hard algea in one particular location over the last couple of months. They are clearly growing and spreading. I have started to notice a few in other random locations now as well. They are kind of cool looking, but as with anything I don't know in a reef tank, I am a bit concerned. Can anyone help?

of=50,590,442


of=50,590,442
 

Phyl

Officer Emeritus
Officer Emeritus
Oh yeah. Ultra-rare, super nutrient export macro algae! :) 10% for my cut will be fine.
 
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