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Tank is 4 months old. Just did an algae removal. I can take a clearer pic in the morning I guess.Unfortunately can't tell anything from that pic. Please take clear pic under white light and how old is the tank? Coralline typically starts on plastic parts long before rocks like powerheads.
If it doesn't blow or scrub off easily then it is probably coralline.I guess I will know in a couple weeks because whatever it is has exploded but they are pinhole purple and green dots
looks like typical new tank green algae to me
Better pic