How to get the best out of my c02 tank

What up so i just got a new c02 tank its not a big one but it will do . I am just wondering if the way im plane on useing it is going to worth it .Im going to only use it for the last two weeks of flowering and im going to have it on a timer and have it go off every so often . and im going to run a tube around my flood table and have some holes so that all around the table it gets a even amount of c02 . I know that 1200 to 1500 ppm is what they do best at i just want to know whats the best way to use it for the time i want to use it . So please if any one can give me some pointers i would deeply apricate it

please can any one please help me i really need could use it

co2 is heavier than o2 so it will fall and i would use it all of your grow not just the last 2 weeks.

cool thats good to know . But i was told that if you use it through the hole grow they get to depent on it. And if you dont give it to them for some reasion they will just die . And also my tank isnt that big so i will probly use it for the the last mouth of flowering just to give it a shot . I have never used it for a grow so im kind of experimenting with it . I just heared to many good things about it to not try it