I have a three-chambered refugium. The first is for the return and skimmer, the second for the refuge and the third is the return. The second chamber has about 1 inch of sand, some LR rubble and Chaeto. I purchased the Chaeto about 1 month ago and it has doubled in size. It doesn't roll but ends up near the overflow to the return chamber. Occaisionally I move it around so it gets enough light. My lights are also on the reverse cycle but don't see much in the way of ph stabalization. Also have snails and amphipods living there too.
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