Ah that's why I didn't recognize it. It would be kind of cool to see it done on a private tank. I've only read about them being used on some large public aquariums. I'm personally more fond of an over sized skimmer for getting rid of Nitrate and GFO + macro algae for Phosphate. Have you budgeted space in your fish room for a fragging station and a laundry room style sink?
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