I am pretty sure the cause is lack of nutrient export as the skimmer is only a Remora, I don't have a refugium, and I am merely running PhosBan in an AquaClear.
I'm testing 0 on Phosphates and Nitrates using Salifert test kits, but that doesn't mean anything... LOL!
I have been buying my RO water from the grocery store. They have an inline TDS meter that always reads <5 ppm. I just bought an RO/DI unit for myself though, so hopefully my improved water will help a bit.
