From my understanding, vinegar is added to lower the level of ph in kalk. Kalk has a ph of around 12.0 and some ppl already have their ph at a good level so they add vinegar. I, on the other hand, dont add vinegar b/c my ph is always a little low. Luna _________ 9YR OLD 90G/55g custom sump/refug Mag18 Aquac 180skimmer 692w MH AC jr,yel&kole tang,midas&convict blenny,B&G chromies,Blk/yel fin chromie blackcap,nemo,neon goby,6line; Blastomussa Merleti,Acan ,BUBBLE,Torch,LTA, Acropora(2) Moon, assort zoas, yel& G star polyps, P&B ricordia, montiporas, cup&candy corals, xenias,B/G mush,flower ane(2), cherry red mussa, dusters,cleaning crew..  |