Thanks for the replies, I used mineral mud in my refugium last time and found my calupera grew rapidly. I'm thinking though of not using calupera so much as seaweeds... I've got tons of research to do, got the tank ordered, I'm making some of my own live rock, I'll probably build a 33 gallon sump but if I decide not to go with the refugium then I'll make my 45/55 acrylic tank into a sump.
Doug
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