I have a Dual Stage SS Victor regulator, Mouse solenoid with 3-port manifold and various fancy needle valves.
Tank is currently running on a 20oz paintball cylinder, as I need to get my 10lb tank refilled this week.
While paintball is cheap and easy at first? It ends up being more of a hassle and expense in the long run. $40US, roughly, for a paintball kit. When you can buy a regulator here on the TPT for about the same price.
You can get a dual state regulator, solenoid and needle valve for around $100US. You can use a paintball adapter ($15US) with the regulator so you can attach to paintball tanks, if you wish. But you should be able to obtain a new CO2 cylinder ranging from 5-to-10lbs for $40-$70US.
Added 11 (or 12? too quick) Boraras brigittae this morning and they're doing quite well. Already hunting, the fat little buggers. And little is an understatement. Perfectly scaled for a tank this size.
Will post photos once they color completely up and I more time to adjust the shutter speed.
Contemplating replacing the Bacopa with something flowy like Narrow Leaf Java Fern.
There's just so much water flow at the top back of the tank - even when throttled - that I can't help but think something moving with the current would be nice. Bacopa, while now growing out of the water, is having a tough time standing tall in the flow.