"Dave" wrote in message
...
"Rick" empowered us with this mighty blow against
It sounds like you might have a large tank, given that you're using two
one-gallon jugs for CO2 generation. It's possible you may need to use two
of those diffusers instead of one ... the amount of CO2 generated may
overwhelm only one diffuser.

the tank is a 77g which is the size of the tank the guy who gave it to me
had the two bottles hooked up to. He ran it into a powerhead though. He also
gave me a simple set up for a 2 litre bottle so I'll try the Hagen diffuser
and if it seems to overwhelm that system I'll use it in my 33g planted tank.

Rick