waterchanges

I currently have an issue with my water changes. My current salt butch has a KH of 7dkh calcium of 480 and magnesium 1400. My tanks dkh is around 8.5 my calcium is a bit elevated at 490 and my mag around 1450. I do a water change of 50 liters in a 370 liters volume so its about 20%. My problem...

For water changes, I mix my RO/DI water into saltwater in my basement in a Brute trash can. I then pump it upstairs to my tank through a garden hose which has never been used for any other purpose. I was recently watching a BRS video and they mentioned not using a garden hose. Could I...

So in my tank, last summer my setosa colony and other sps corals does because of a pump failure whilst I was away for a week (even my rainbow chalice frag :eek:) but I still have a bunch of lps and zoa's etc. When I had sps I would do weekly or sometimes (rarely) biweekly waterchanges to...