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CO2 Regulator

I only left a long length of CO2 tubing to in tank diffuser so I could easily experiment moving the diffuser around in the tank to optimise CO2 dispersal.

You are using CO2 tubing ? Normal airline tubing & silicone tubing will go hard eventually with CO2. CO2 actually dissolves in silicone apparently.
 
Was that for me Ian?
Yep, using CO2 tubing bought from AE. That stuff is not flexible!
HA!
 
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