I'm no plant expert by any means.
For my co2 system I used this stuff:
S.T. International Aquarium CO2 Glass Diffuser, 20mm
https://www.amazon.com/dp/B00I47YVVU/ref=cm_sw_r_awd_R1eawbV8YB8H7
AQUATEK Bubble Counter with Integrated Check Valve (R-131)
https://www.amazon.com/dp/B008UC7SSW/ref=cm_sw_r_awd_c2eawbHNEQH16
AQUATEK CO2-Proof Tubing 16 Feet
https://www.amazon.com/dp/B008UCOFJW/ref=cm_sw_r_awd_u2eawb0Y93YH0
Premium AQUATEK CO2 Regulator with Integrated COOL TOUCH Solenoid
https://www.amazon.com/dp/B009WTXYN0/ref=cm_sw_r_awd_L2eawb71HS4Z0
This attachment is if you use a paintball co2 bottle:
AQUATEK CO2 Paintball Tank CGA 320 Adapter
https://www.amazon.com/dp/B004M49QDC/ref=cm_sw_r_awd_j3eawbF9S9RAX
I've used 24oz paintball bottles but this is what I would recommend to last you a long time before needing a refill:
Zebra DNA Luxfer L6X Aluminum CO2 Tanks with CGA320 on/off Valve (5 LB, Brushed)
https://www.amazon.com/dp/B0085282UK/ref=cm_sw_r_awd_-3eawbYH1TV9H
Of course if you can find things used the may help prices, I didn't want to skimp of a pressurized system though. Trust issues of equipment failure ya know
Caleb