Very nice upgrade sir
That skimmer must hold at least 20g right? empty out that beast and your water change is done!
I have that same 3g pico tank. One huge tip, before thinking about any corals or sensitive inverts, plan out and test a auto top off. keeping the water quality good is easy, but salinity is a impossible feat without 2x per day or more manual top offs.
For mine i use a par 30, and everything is really happy.
.......anytime you decide to downgrade from that big tang setup, ill trade ya my 90. LOL.