I've been feeding my fish by hand since I've had them, but I have a vacation planned out of town and no one nearby that I trust to feed my fish. I've used those vacation feeder shell things before on generic tropical fish way back in the day, but I don't know if they're alright for my Africans for 3-7 days. I'd rather not shell out $100 to put auto feeders on my tanks right now, anyone have any suggestions?