Need some help with my skimmer.. pics

[One_Divided]

This is a DIY Hot-1/airstone style skimmer.. I am having a little trouble getting the collection cup down.. foam production and the return are fine from what I can tell and I am not losing bubbles. I am having a little trouble figuring out the best dimentions for the collection cup.. right now, foam makes it up to the top of the cup tube sometimes, but doesn't quite seep over. It just bubbles at the top and then dies down.

Would it help to shorten the tube between the reaction chamber and the collection cup? Or should I make the diameter of the tube smaller.. I originally wanted it to be 2 inch, but I couldn't find any in town and thought 2.5" would work.

Or should I try lengthening the inside cup tube so that the foam hits the top of the collection cup and spills down? Similar to a remora hang on..

Thanks in advance for any help!



Photos:

http://livevictoria.com/limestone/reef/skimmer01.jpg
http://livevictoria.com/limestone/reef/skimmer02.jpg

Sorry for the rough diagram.. I forgot to mention that the reaction tube is 4" acrylic.

[ 23 December 2001: Message edited by: One_Divided ]