i use a 2 part dosing system and add manually, for the calcium and alk. now when is the best time for this i hear before the lights come on since that is the time the ph is the lowest but can you dose lets say 3 hours after light out since my lights go off at 8pm i could dose at 11pm before midnight and bedtime ? also where do you dose if you do in the sump or in the high flow zone of your tank ?

