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[jlw82]

How do you allow for the filtration?.. Especially the part of the cannister filters that puts the water back in the tank...

Cheers for all the help!

[DarkSoul]

if your making your own, you just measure, and cut out channels in the foam where the stuff will go.

[Rbishop]

Or use an extension tube to get the return out farther in to the tank before using the 90 to go back down.