I made this sponge filter using one of those fluval edge pre filters into which I inserted an appropriately sized plastic tube. I then inserted an air stone inside.
My main questions are:
1- do you think this small of a sponge will provide sufficient filtration when connected to a 5gallon air pump for a 2 gallon shrimp only tank?
2- will it increase it's efficiency if I drill/ cut large holes at the bottom of the updraft tube? How big Should the holes be?
Also, Should the airstone be placed all the way at the bottom of the tube?
3- will shrimplets get sucked into it or into the bottom if I don't put a stand under it?
here's a picture, looks pretty sharp.