When everybody boasts about their fluffy pets you're standing away indifferently because you have a fish and you absolutely like it? Maybe, this issue is especially for you. You'll never forget to feed your soundless friend if you have a special gadget!
When you're out of town or going away for a long time, your fish will be full and happy. Combining an Arduino Uno with a floppy drive stepper motor, hard drive enclosures and an adapter you can make an automatic fish feeding machine.
The full tutorial you can find here.