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I have the urchin standing one, like yours. I run the cup all the way down. However it is running in a 20 long with a really really old maxijet...
http://www.reef-eden-international.com/POLYPLAB%20MEDIC.htm
If you want some science rather than hippie magic... Go ahead and treat your tank for 21 days with crystallized peroxide salts. This has been...
aquaC Remora is a good one for a HOB. I have the urchin in my frag system and it works wonders!