Hi, I was just wondering what is the difference between the Hagen co2 formula and the DIY one? Does the Hagen work better? Anyone use it in a 2 litre pop bottle?
I have never seen it in action, so I don't know. They had it on the back of a tank at the pet shop the other day but it had run out; so never got to see the ladder working on it.
Thanks for any replies.