do consider DIY
Never really worked with acrylic before and did have a couple of problems of my own making (suggest listening to the wise and don't try to get fancy with a groove in the flange for the o-ring) but built a simple 6x19" CO2 recir reactor that sits outside of sump on a 10x18" footprint including CO2 bottle.
With what seems a relatively low bubble and drip rate holds my tank at 350-360ppm Ca and Alk of ~10KH
The reactor including the Mag3 cost about $150, used CO2 bottle and reg I got for $100 and think about $25 for the solenoid valve.
Can ask a welding shop about bottle and reg but have also seen combo at J&L etc.
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