Yes, if you went whole hog with the Reg/CO2, you need to go whole hog with each part.
No rush however.
Tank does need some hardscape, or are you going to do the Dutch style?
No need for the Ecotech on this size of tank, yes, I have one, but it's out in the garage in storage.
I took the MP20 off the 120 Gal tank, I still use the MP40 on the 180Gal however.
At most, a small as possible micro powerhead is still smaller than the wet side of a MP10.
And all you'd ever need.
You might get some metal screen and cut it to fit inside the glass cover of that nuke powered light above your tank.
Another thing, having some nice house plants next to the aquarium on stands would look good, eg, Maiden Hair fern in say 1-2 gallon pot.
Most tropical foliage will do very well near the over spray of the MH, and there will be over spray............