My First System..Any Thoughts on Making it Better?

So..I'm still fresh and green noob here.. I have what i think is a pretty sweet setup and I was wondering if i should add a vertical light..and a Halide at that? and hows the best way I should do it? As i said noob.. so be gentle.

Room: 4x6 tent
Lights: 2-6in AC xtra sun reflectors w/glass w/ 2-600w HPS bulbs with a 6in 435 CFM fan exhaust all inline straight through the tent

Intake: 6in 435CFM outside blowing in w/ carbon mesh screen on 24hrs

Exhaust: 4" 190CFM fan w/ 4x12 carbon filter on 5mins off 5mins off cycle timer

System 1 & 2: 2- aeroponic posts, 4- 3" net pots in each post..each w/ 590gph and micro diffuser in res (6gallon), 1/2in pvc pipes run inside post with ez-clone sprays throughout, runs 24hrs. also 2-4ft long air difuser (ropes) run throughout posts

System 3: 5 gallon res over a 3 1/2 gallon control bucket feeding 4- 2 gallon bubbleponic buckets each with a 3" net

So im looking to make any of this better..any thoughts? I currently have no CO2.. was looking into green bags.. or this bucket i keep seeing at the shops..

Your setup seems pretty solid to me. I am pretty new also, but with a tent that size you can make a Co2 factory for a relatively low cost. I found this idea here SnickerDoodle's The Light's, The Weed, and The Wardrobe

All you need is a large plastic container that is airtight. drill a hole in the cap and add a piece of tubing from that hole to a glass of water. Fill your container about halfway with warm water and a tablespoon of yeast. And some sugar, not sure the amount though lol

The purpose of the cup is so you can monitor the Co2 production, but it also fixes the problem with overflows, because it just goes right into the water. You will need to change the water everyday but you will see very big differences in your plants.

Peace & Pot errbody

And I can't wait to see it sporting some lovely ladies