The refugium acts as nutrient control, and a safehouse for pods n critters. water changes done regularly will control this as well. Do you feed live/frozen foods? That will affect a nano hugely! A quality flake or pellet food seems to heavily reduce nutrients that frozen foods put in...
Have you a test kit for nutrients? It will help ya narrow down Wut could be a source for trouble...
There r many arguments for and against a nano-refugium type setup (usually modded aqua clears), I have tried both and found that they are beneficial, and can clear up the display ei; you can stuff ur heater n such in there for a cleaner look!
This coupled with a solid maintenance routine will do the trick!
IMO
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