My calcium is always around 550 on my 20 gl reef because i cant keep it down when i use it. Fair results so far though. Only dose every other day, IMO.
I second the above post. I have been reefkeeping for almost two years now and about 2 months ago I started using RO water. I have noticed a great improvement in the health or my corals, the overall appearance of my tank, and my water quality.
He is still doing about the same, although he has been bothered a little bit by this recent heat wave here in california which had my tank temp jumpin' up a little bit ;(
But hopefully he is on the way back to sucess.