Ehim feeder has worked best for me.
It is pretty well built and reliable.
I agree with practicing with it before hand.
Tricky part is to adjust the food rations. I think using the feeder to feed small amounts twice a day works better than feeding a large amount once a day. In order to secure things, decide the level of opening that you want to keep on the food window and then stick a small piece if duct tape on the side of the slider, so that it secures the window in one place.
I was gone for 3 weeks and everything thing was A okay when i came back. I did ask a friend to check on the tank once ir twice a week though. But i don't trust anyone with feeding my fish so i left the feeding part to ehim.
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