Has anyone had any luck with automatic feeders? (Not the feeding blocks, but the automatic feeders that you program) I have a 3 gallon tank with one betta and plan to be gone for a few days (up to 3 days).this winter during the holidays..is it worth purchasing a feeder? The tank is glass...I am afraid that with the weather conditions we may be delayed on our trip this winter....would always be worried that my betta would be very hungry by the time we get back. I have read awful things about those feeding blocks, so I hesitate to use those. Any thoughts?