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I have a bubble magus curve 7 sitting in my workshop. Opened, but new
$200
08401
https://www.bulkreefsupply.com/curve-7-protein-skimmer-bubble-magus.html
Don't waste your time with any form of gfo. It's gonna get expensive, and I think it's a pain in the ass.
Carbon dosing will help once things get more manageable and at a better ratio, but I would try lanthinum chloride first.
Very very slowly. I have no evidence that phosphate binds to rock...