what happened if i just stop using co2 in my planted tank?
You'd have more stable water conditions.
Your PH would go up depending on your KH and GH.
The fish would be happier, the plants wouldn't grow as much.
That depends on how much light you have over the tank.
If its a high light tank, you'll start getting noticable amounts of algae.
In a medium or low light tank, plant growth may stunt or stop, crypts will melt.
And, as mentioned, your pH will increase.
alright thanx bigdaddy
i was thinking about stoping using co2 when my plants will reach the surface. i have 1.6 wpg of light with low-medium plants