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My thoughts as wellI believe like palys they can pick up grains of sand.
any luck with treatment? looks like my zoas have it now..Yeah could be something similar but luckily my zoas don’t seem to be affected (yet ). I ordered a bottle of nitrofurazone since Furan 2 is not available anymore. I got a 250 mL 0.2% solution, should be fine for corals aswell. Only contains water, PEG 300/1500 and nitrofurazone (0.2%). Will start treating it with that when I won’t see any improvements after todays iodine dip.