specific gravity-1.022
This is a bit low for soft corals. Though they may adapt, they do better at 1.024 or more.

There are things that eat those; not only fish but some small inverts will eat them too.

If you change 10% of the water every week, what kind of salt mix and what kind of reconstituting water are you using? With basically a 40% water change per month, it makes a lot of difference. Both need to be high quality and the salt needs to be complete with trace elements.