I don't think he has an RO
unit, he stated he got the 5 gallons of RO
from the local water company. As everyone said you have to get the nitrates down. The thing about your PH going down can be from the coralline stimulater you used, in order to stimulate the growth, the stimulates usually contain high concentrations of calcium, strontium and magnesium which is all good except when you raise your calcium level your alkalinity tends to drop with the end result being a lower PH. Alkalinity is the natural buffer for your PH, when the alk
is maintained between 7- 12 your PH will remain stable and usually at the proper levels but if it's out of that range your PH usually fluctuates drastically. Usually when calcium is dosed it's usually done with a 2 part product with the first part being the calcium additive and the second an ALK
stabilizer to compensate for the ALK
drop caused by the calcium additive. If you can test your ALK
test kit), I like to keep mine at a minimum of 8 preferably 9.