03-02-2006, 09:10 AM
Join Date: Feb 2006
iTrader Positive Rating: 100%
You might have troubles if the output of the CO2 is at different pressures (i.e. if the output of one is deeper in the tank then another, if you use different types of diffusers, etc.). You might find most of your CO2 tries to go into your 5g.
A seperate needle valve for each tank would make it easy to adjust tho.