Hi All - I'm a new poster and have a situation I can't figure out. I have a 75G mixed reef and a 29G sump/refugium. I use RO/DI water and a 50/50 mix of IO Reef Crystals and Seachem Reef Salt and do a 10-15G weekly water change. My water parameters are: Ammonia - 0, No2 - 0, No3 - 0, Alk 9-10dkh, Ca 440-460, Mg 1245, and SG at 1.025. The issue is I can't get my pH out of a 7.8-7.9 range. It is stable at that level, but lower than ideal based on my research. I have just gone through a bottle of Seachem's new "Balance" product from the AquaVitro line that is supposed to address this issue. My water will test up to 8.1-8.2 after dosing, but by the next day is back to 7.8. Does anyone have any ideas, or should I leave it alone since my other parameters seem OK? Thanks for your help!