Hey everyone, (first post)
I built something very similar not that long ago, I used a piece of filter foam at the top of a small cylindrical clear plastic canister ( I didn't want to see it)
It worked a treat, but over time (say 2 months) the filter foam turned to absolute crud, A grey indistinguishable mass of stuff.
Not good for letting C02 out finely if you ask me.
I personally like the idea of the coffee bell, that sounds like a goer in small tanks.
BTW, Fedge you and I are in the same boat, I've got a 10 gal that's being over wrought by reddish ludwigia repens!
hehehe...
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