tubing

Hi! I'm new to tge forum and in need of help, so thought it best to ask here since there is far more knowledhe here than mine! So i have a fluval flex 57 litre (15g) and i was trying to open the front of the pump to clean the filter foam. I couldn't get tge tube off so i tried with it still on...

Hello, I bought a EHEIM ecco pro 300 External Filter waiting for delivery, The Eheim site says for the ecco pro 300 - Hose Ø Suction side(inside) 12.00/16.00 mm, I am buying a Hydor ETH300 External Heater that says it has inlet hose 16mm, Connects to 16mm & 5/8" Hose. Sorry it's a daft...