I'm looking at this sponge filter but don't see any tubing. Would I have to supply a tube and air stone for this and run it down the neck?
Don't cap it, attach the airline tubing to it. You'll see water flow up and out of the larger tubing. I have one like this and don't like it at all though. Wait until that suction cup no longer holds. I much prefer the ones that just sit on the bottom of the tank.yup cap the nipple and youll be good.