Ga-rr-ett

I read on a web site to add 2 cups sugar 1/2 tsp yeast and water up to the top of the lable in a 2L bottle is that a good Co2 recipe for a ten gal. If not what would be better and i dont have a check valve so is it safe to just place the bottle higher than the aquarium.

i only have a few plants.

mathas

That should be fine.

That would probably work, but I'd personally feel much safer using a check valve. I'm not sure what pricing is like north of the border, but they're less than $3 in my area.

I'd also consider adding a gas separator, like the one MPrudent shows in his post here.

Indian_villager

If its higher than the aquarium it is impossible for your tank to siphon out.

Ga-rr-ett

ok thanks