They are only on the sps I have at the top of the rocks. Everything else looks normal... The only thing I can think of is maybe not enough flow? Maybe micro bubbles from the skimmer are collecting there?
Walter
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*30g+- (24x16x18)
*Seio 620 + MJ1200
*EuroReef 5-2
*Ebo - 100w Heater
*250w PFO HQI w/XM20k
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