how much co2 do plants use??

how long should i leave my tank off for in between cycles, my room is 2x3x6 with 5 plants

bump..................

check this out... http://www.hydroponics.net/learn/co2_calculator.asp

^thanks but no thanks, maybe you dont understand. that calculator tells me how long to leave the tank ON for,I NEED TO KNOW HOW LONG TO LEAVE THE TANK OFF FOR!!!!!!!! "how long should i leave my tank OFF for in between cycles"

It comes down to your set up,

yeah you should have a gauge in there telling you hoe much Co2 is present, althought I am not 100% sure on the amount of Co2 that should be present I am sure you can find it on this site or through Jorge Cervantes

without knowing how much co2 is being pumped in you will not know gow long to turn off

a guage or sensor is to much money, i know how much co2 is being put in there 0.052 cubic feet to bring the ppm up to 1500. but THIS STILL DOES NOT LET ME KNOW HOW LONG TO LEAVE IT OFF FOR!

any more help???

bump..............

How much to they use? How long is a piece of string?

How many plants?
Total surface area of the leaves?
Temps?
Strain?
Lights?
Humidity?

Get a ppm controller. Yeah, they are expensive, but 'right' is rarely inexpensive.