Was just wondering if some1 can have a quick look at my idea. It's pretty much like the usual method, just the way of introducing the co2
isnt with an airstone but with a powerhead with the venturi attachment.
Firstly, I'll make a 2L Coke bottle as the generator, connect that to a powerhead with a "venturi" thing (like the Hagen 20 powerhead), then connect the output of the powerhead to the gravel vac with the sponge at the end of it, and that would be it.
I pretty much want to keep the unit as small as possible, so I'm thinking of using Lees Small Gravel Cleaner (Lee's, 1.63" diameter x 9"H tube with 56" length hose) and a Hagen Aquaclear 20. For the sponge, I suppose filter floss is perhaps a bit too fine and not coarse enough? I was thinking of using the Eheim 2213 Knitted Filter Pad (I don't know what size it actually is, but I'm hoping it will do - the LFS
doesn't stock the one I saw on the instruction page). Also, I plan to drill the hole and seal it with a silicon based sealant. The sealant can be just water-resistent doesn't it, rather than the one's design to be continually submerged in water?