I'll pick up a the additional test kit for reefs soon for sure, I know I should be monitoring those parameters as well.
I'll move the frag to the top of the tank and and tweak the lighting a bit to see how it likes it.
Will too much flow adversly affect Zoas? With such a small tank size, a single powerhead is definitely moving water so the flow is pretty solid everywhere in the tank. I don't know if there is a such thing as "too much flow" for certain corals, as in enough flow to aggravate and cause a coral to close.
Thanks for the advice guys, much appreciated.