thanks for the useful information, Jerry.

I'm using whole pellets which tend to stay down for a longer time in the tank. Only hope that the zebs will be able to get their food.

Hi
It sounds like a good idea but with zebs I think the other way round,as I find they eat a lot better when the food comes to them like in the wild so it passes them or the area they are in,especially smaller fish ( not sure size of your fish).
I do have foam over my uptakes to stop food going in ...