Will be on a week long vacation for Christmas. I have a automatic food feeder I picked up from Wal-mart. It works as it's suppose to. Only problem I believe it's dumping too much food into the tank. It does have adjusting lever, but at the lowest it's still too much IMO. Any recommendations from those who have used these on how to adjust any further so I'm not polluting my tank before I get back?

My initial thought was pushing a piece of foam up that tube to narrow it even further. Leaving on the 21st, so I have just over a week to come up with something.