Im working on this desing here
http://www.hawkfish.org/snailman/diy3inskimmer.htm
And have a question on the tube that goes to the colection cup how far from the water level should it be.The collection cup is 12" and the tube from the skimmer body to the collection cup is only 6". It make me wonder if the tube should be longer then 6" as it seems as very little of the collection cup would be used. And if raised in the collection cup as in the picture it is no where near the water line in the skimmer body.
http://www.hawkfish.org/snailman/diy3inskimmer.htm
And have a question on the tube that goes to the colection cup how far from the water level should it be.The collection cup is 12" and the tube from the skimmer body to the collection cup is only 6". It make me wonder if the tube should be longer then 6" as it seems as very little of the collection cup would be used. And if raised in the collection cup as in the picture it is no where near the water line in the skimmer body.