Don't I need a check valve so that the water doesnt flow back into the bottle by accident?ChriX said:You don't really want to be putting any backpressure on your bottle by slowing it with valves or anything.
Too much co2 can be detrimental to the fish (over 25ppm according to sites i've read).
I think I am going to try just an airstone on mine rather than the powerhead, because i'm getting too much dissolved, as this new bottle seems to be going at the same rate after just several hours.
I was just messing around my co2 tube and tried to put it in a powerhead... but it was causeing the powerhead to cavitate and stop pumping... heh guess its time to build a bell.....ChriX said:I've also succeeded with it, I fed mine into the bottom of a little powerhead and sat it on the bottom of the tank. However I was getting a bit too much co2 from my last bottle so i've made another that hopefully will go slower. I suggest watching your pH to make sure you don't over do it.
It all depends on your mix and how much you get dissolved though. I thought I was making a relativley slow mix, but I was getting on for 30ppm of CO2, which isn't good when you're trying to keep fish in there.Silly me said:I have 2 bottles of yeast, and a DIY power head reactor, but just with the outlet of my external filter, and at 2 bubbles per second in a 36Gal tank I cant get over 15ppm of CO2 so I dont think you can overdose a 20Gal or more with a DIY setup..