Woops dkh & Kent Superbuffer

[Justin]

Well I set up a new tank a couple weeks back. Everything was fine with the basic water parameters, ph 8.0 dKH 8. I wanted to jump the pH up a little, so I used some of the stuff I use for my african cichlids. What I used was Sodium Bicarbonate. Did a couple teaspoons. Low and behold 24 hours later the ph was down to 7.8. I was like WTF. So I went and got some Kent Superbuffer dKH from work, did the recomended dosage. 24 hours later WTF. The pH was 7.6!! So I thought I screwed something up. So I went and added another dosage of the Kent superbuffer. Came home from work today, and all over the walls of the tank is this white deposit, I am assuming is chealated calcium, but I have no idea. It is on everything and I scraped some off with a razor, it's hard as a rock. Within 2 hours it's already redeposited. It;s now all over in the water column as well. WTF happened and how do I fix it? The PH is down to 7.5 and the dKH is over 30. Thanks guys & gals!

Justin