Thanx for all those replies. Barr, as u mentioned i tried going thru this article, (
Venturi Design)
Seemed to struggle with the concept at first but later realised wot i had missed in the diagram.
I'll try n explain wot i've understood n if i'm wrong newhere u'll have to correct me
Firstly i'll need a powerhead thats good enough to work bout 10 hrs a day, and connect water inflow pipe(in this case co2) to the reactor from the top, also take another pipe and connect the outflow of water fromthe powerhead n connect even that to the reactor form the top. Leave a burp hole below the level of both the venturi loop holes..so that if theres collection of gas it wud escape. On second thoughts would it be a good idea to use the same powerhead of my sponge filter, i'm just scared bout it getting burnt out by too much use, cuz my last one (smaller than present one) got screwed when i tried running it for bout 15-18 hrs..
Also i wont be getting a viewtainer as its not a concept still seen in india, so i'll be using a 500-600 ml soda bottle instead after removing the curved top half, knowing the volume of the buildup of Co2 might help me arrange for the size of the remaining part and the distance between the burp hole n the inlet n outlet holes for co2.
Wot i'm still struggling to understand is the relationship of O2 and CO2 dat u mentioned in that thread...Do u mean that dissolved co2 will be let out of the reactor eventually while the tank still sustains the o2 levels? (something close to dat??

)
Finally, as of now my objective is to order the plants i listed so i cud get the delivery by next week...so i need to know how many plants shud i actually get for my tank. Just browsing thru the forum i came across this principle that i really liked which said "Give the plants space!! Lay out the plants at the start with anticipation for where they WILL BE, not where they are."
I think i had somewhat instinctively thought bout it before n thats y i wanna know how many is too many for my tank?
I'll try n keep it short next time
Thanx again n regards
Mohit