My nitrates in my aquarium are at about 200ppm. I purchaesd a ro/di unit with five stage filtration a aqua clear pro series 150 wet/dry sytem. my tank is 75 gallons. I have starburst polyps a spaghetti finger, several mushrooms. They all seem to be doing fine. My phospates are near 0. I was told to remove the bio balls from diferent sources. I replace the skimmer with an aqua c remora pro that i already had on the tank and place it on the sump. I have twelve mangrove plants. That i have on the retun side. The wet dry is dry new. I am converting from an ehiem wet dry canister. I also have about 80lbs of live rock. how can I convert this into a refugium with a sand bed. I also have a yellow, naso, and blue tang and two ocellaris clowns, two tomato clowns, a coral beauty, and two reef damsels. Sorry for the long question. I also have two 250 watt mh with vho actinic tubes. The tank has been running for about five years. I just got into corals about three months ago. I also use live sand.