Lance's 225 gal tank

[Lance]

Originally Posted by marie

Check your pumps and heater for precip. I've had that happen to me over a period of a few weeks...couldn't keep the alk level up for the life of me and then my pumps seized up and I discovered where it went. It could be your cal/alk demand has dropped causing your alk levels to get high and then precipitate out

Nope, pulled a pump apart: very little precip. I just don't understand what could have caused the Ca level to rise so fast. There has been no change in the tank, except for a few SPS and zoa frags I added four days ago. Corals are growing so the Ca requirements shouldn't have dropped. I'm really baffled by this one. I have stopped dosing Ca until the levels get back to normal and will see what happens.