I dun think water changes can keep up with the sps demands. Unless u do like twice every week. Depends on how much sps u have. Just constantly monitor it. might have to add more kh and ca
Yup used a air wood skimmer last time. The wood had to be replaced regularly. Also could be caused by other things. Last time I added carbon in and it couldn't skim anything for a week or two. After that it returned to normal
Im keeping it in my tank for a few weeks already, seems quite ok. I have a 2ft dt with a 2ft sump. I bought copepod cultures to seed my sump. also i feed arctic pods on alternate days.
recently i bought a sps colony from AM and when i came back i dipped it in a few mins in Coral RX. Yesterday i spotted 2 crabs inside, luckily it seems to be the smooth shell type.