I mentioned skimmer because of possible chemical substances, the leather are secreting - but you better know your tank, it was one of possibilities.
LPS ans sps were growing good for me - without any special care, except the light, and mine is even lower, than yours.
If they grow in my tanks - they surely should grow in your. I'm using conditioned tap water, salts, with raised Ca and Mg, alkalinity additive in some tanks, that do not hold alkalinity themselves good. SG 1.026, t 78F. Tanks are fed, at least cyclop eeze. It's all.
The easy LPS I received as a frags, damaged during shipping:

Recovered even in low light tank:

Later, in higher light, frogspawn and hammers (frogspawn also comes in cold green color):
Candycanes:
the green recovered:

This, more high light loving, at arrival:
and recovered, the bicolor was very slow:
Blastomussa merletti (B. welsii will be more colorful):
at arrival:
Cynarina:
at arrival ($10!):
Later:
Will continue.