are you measuring your alk in meg/L. If so, If you multiply your reading of 2.8 meg/L. by a constant of 2.8 you will get the dkh. How old is the tank and what are the other prams? Phosphate, ammonia, nitrite, nitrate. Are you going to be keeping SPS corals, mixed, (sps and lps) softies, or fish only.