Automatic feeder recommendations?

I've got a 90 gal system under my care; right now it's fish only with a
few Hermit Crabs, and Snails will go in any day now... I'm still working
on water chemistry to get it just right before any sensitive inverts go
in.

But I'm not there every day. And I want to see to the fish getting fed
regularly, maybe even twice a day. They're eating flake food and loving
it, with occasional frozen treats for variety.

I'm not worried about delivering the frozen stuff automatically; that'll
always be a hands-on kinda' thing, when I'm actually there observing,
and doesn't have to happen on a schedule.

But I want the staple diet of flake to be delivered on schedule every
day. The problem with that is, flake food is not heavy enough to drop
through the water's surface tension by itself. Most auto feeders I've
seen just drop it on the surface and down the return overflow it goes!

Is there an automatic feeder that'll deliver flake food *through* the
surface tension, or some other method of whetting the flake so it
doesn't go right down the drain and clog up the pre-filter in the sump?

Thanks,

--Charlie Henderson