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That’s trueUrchins do it tangs can do it. Any algae eating fish can do it
I guess we have different ideas of what the circles are in your photo.
Anything would helpI guess we have different ideas of what the circles are in your photo.
Yes new rock but it was washed before add to the tank. The whole thing was covered in green algae just like the areas around it..Hey is it new rock from the shop wondering if something has been stacked up on it, or some chemical dropped on it
finger prints? oil from fingers when you placed them?Yes new rock but it was washed before add to the tank. The whole thing was covered in green algae just like the areas around it..
That is a possibility but not sure. This the first time I experienced thisWondering if your "algae" is actually something like diatoms or dinos, and those rings are die-off.
No I washed my hands and rinsed everythingfinger prints? oil from fingers when you placed them?
150 gallons total including sumpJust out of curiosity , what is the volume of this tank with rings?