It's this one made by Aquamedic you need. Comes in all the sizes you could ever want.
Works a treat. There's a thread somewhere here about why CO2 in the filter is actually fine for bacteria - think Clive opined with wisdom as usual.
You got that right! I've got one just by this T-piece, one just in front of the bubble counter and one just beyond it. Call me paranoid, but they're only cheap if you order off ebay and not having my tank empty into the CO2 canister!
Works a treat. There's a thread somewhere here about why CO2 in the filter is actually fine for bacteria - think Clive opined with wisdom as usual.
Just make sure you have a couple of no-return valves on the co2 hose
You got that right! I've got one just by this T-piece, one just in front of the bubble counter and one just beyond it. Call me paranoid, but they're only cheap if you order off ebay and not having my tank empty into the CO2 canister!