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I'll be replacing one of the Tecs and if possible removing the Koralia as it's rather old/large and a bit unsightly. I'm assuming that I'll need a new in-line as well? From what I've read the pipework is a few mm wider.

co2 is via an in line on one of two Tetra tecs. I don't use a spray bar on the co2 filter out let (into the tank). Currently I have 2x 1200 tetra tecs but I need a bit more flow.

and what about the out let....is it the same?

Anyone know how far you can extend the inlet under the water line? All the shots I see of the in-let seem quite shallow. I want the inlet as low as possible for CO2 injection. Any other comments from those who have a FX6 greatly appreciated.

Hi ste_v5, I have a 260 and run 2 tetratec 1200's and a power head. You may get away with less if it's not a hightec tank - but certainly not as low as a 700.