your off to the right start little buddy , told you this was prob your issue and its common for those with very low nutrients and very bright lights, at your tanks height there's alot of par at the glass bottom.
so if the other tank is for zoas only then i would thing low par lights that you can increase as things get use to it , you want sps quality water but not at the ulns range.
dip all new comers to the tank as zoas house pests very easily.
lower flow but something that is adjustable is ideal.
run gfo in a tlf reactor , no skimmer is required.
no fish are good but add a few small ones to help with tank duties.
do water changes from your sps tank is parameters arnt depleted to much.
cheers and glad they are looking up youve got quite the collection over the last while and spent alot of money so im glad you were able to figure this out
cheers
denny