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.
You are using CO2 tubing ? Normal airline tubing & silicone tubing will go hard eventually with CO2. CO2 actually dissolves in silicone apparently.