I think u should check your phosphates level too.since you are having some lps. They are not so particular about po4 lvl compared to sps. But too high is not good
Coral dip very important.. dont learn it the hard way like me.. must must rx dip or at least freshwater dip.. when parasites are in the tank.. it is very tough to erdicate it.
Anemone are very sensitive. I added a small wavemaker on the opposite end of the tank. And my dear anemone which has been anchored for 6 months decided to go for a hike.
Temperature, flow rate, lighting, water parameters change all will affect them.
Im a tang lover myself.. this hobby is reallly addictive.. i upgraded my tank twice. Now its ok. When it gets bigger, then probably relcoate him or upgrade to a bigger tank. But be careful when getting new tang from lfs.. most of the time. They are infected with ich though not visible to the eye. I usually quarantine them.