i got a buddy, he has a 75 g reef, with LR and crushed coral, and fish. he doesnt dose anything. i tested his levels and they were 7.5 meq/l for alk, 500 for calcium. he uses a biowheel, and bakpak1 skimmer, he hasn't changed his water in over a month. why are his levels so high. he uses RO from whole foods. maybe they buffer the water?