Advice for a newbie...here is my setup so far

[jtbadco]

+1 for testing.

Sounds like you have an awesome set-up but you really need to regularly test for Ammonia, Nitrite, Nitrates, phosphates, pH, and salinity (sg)

It is very important to keep the salinity stable...I would pick up a new refractometer if you are not getting consistent readings. Have you calibrated it lately?

+1 for only adding one fish every two weeks

You want to feed a variety of foods but do not over-feed your tank either.