Nvert,
First off, awsome tank!
If you don't mind me asking, it looks like you faced the same dilema as me with pH all over the map, and dosing kalk. I quit dosing kalk, I see the thing about vinegar, could you go into a little more detail about how go about it? Also, you said you used a pump to dose kalk at night, I've never heard of that pump, and info about it would be awsome. I have no place for my reef to put somthing to dose kalk, and your system sounds like it works. Could possibly be eaiser to PM then to post it here and get lost, but I'm very intrested in your setup and the details of it.
-- Joe