I’ve had trouble with SPS too but the problem being: stability. I’m still trying to bring my almost 5 month tank into harmony. I was given some free SPS frags from a friend about 2 months in. Couldn’t say no.Thank You Gents. I have note books where I log everything I do with both my tanks. Been doing this for years. I can go back & see trends & such . The tank in question here is my 75 reef experimental tank. I freely admit to not being able to keep any sps long term . I have terrible algae issues etc. But that's another thread. Just trying to keep parameters stable. I "think" I need to keep up on the bi weekly water changes.