ill solve co2 discussion now..
1- regulator coy already has = milwaukee
2- tank not sure if coy has but should be a 20lb tank
2- ph monitor (optional)
Right on BK - I've got the Co2 dialed in (remember my 45 - lol). Will pick up the biggest tank (20lb) that will fit in the stand. pH monitor is likely overkill from what I've heard / read.