6.3 is too low. Media can turn to mush at that level. If dKH is increasing increase the dKH of the effluent by either decreasing the bubble count or decreasing the PSI of each bubble. Do not increase flow unless you can no longer meet the demands (usage) of the tank at a pH level of about 6.35
http://www.reefkeeping.com/issues/2002-05/sh/feature/
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Gary
180 gallon, 40 gallon sump, 3 250 W MH + 4 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx
Current Tank Info: A 2 Barred Rabbitfish, Red Head Salon, Yellow/Purple, McMaster Fairy, Possum, 2 Leopard Wrasses, Kole, & Atlantic Blue Tangs, 2 Percula Clown, 3 PJ and 1 Banggai Cardinalfish , Swallowtail, Bellus and Coral Beauty Angels
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