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- Sep 15, 2018
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I have a fairly new reef tank approximately 5 months old. Currently I only have live rock and fish only. I do a 10% water change every week and use instant ocean reef crystals. My parameters have been stable since I started the tank however my carbonate hardness has recently started to drop. Currently my kh is at 6.5 dkh but has been stable at around 8 dkh previously for the last couple of months. It slowly dropped from 8 dkh to 7.5 dkh over the past month. In the last week and a half it dropped to 6.5 dkh. I wasn't concerned since my ph was always stable at 8.0 however my ph has dropped to 7.8 in the last week and a half also. Should I be concerned? Is it normal to drop that fast when no corals are present? I have not started dosing any calcium or alkalinity yet since I don't have corals yet. It also does not appear that the water changes are raising the dkh.
Tank is a 75 gallon reef with 5 gallon refugium and 20 gallon sump
Ph 7.8
Nitrate 7.5 ppm
Phosphate .03 ppm
Calcium 360
Salinity 35 ppm
Kh 6.5 dkh
Tank is a 75 gallon reef with 5 gallon refugium and 20 gallon sump
Ph 7.8
Nitrate 7.5 ppm
Phosphate .03 ppm
Calcium 360
Salinity 35 ppm
Kh 6.5 dkh