how large is the 204 tubing size ribbed? I will get an inline heater and flo-pipes for straight a's thru middle skool on June 11th, but I need to know the tubing size. I might also replace the tubes with clear tubes from Ace Hardware. Is it 16 mm or 12 mm? or it might be easier for you if I ask for inches, which ever is easier for you.
Fluval 204 ribbed tubing size?
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