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Yup thats my opinion! probably they scrambling food between algae from ATS and macroalgae.
I made create the water flow on ATS over and over back to the screen, finaly to refugium tank then return...

I still confuse baut my refugium tank after i installed scrubber net tank, there is not macroalgae can grow in the refugium tank they all fall out by the time, now is empty only DSB and small live...