you need to feed everyday bud... That's a common misconception, feed often, but not too much at one time....
And hermits clean the sandbed well, they do it after the lights turn off, Be careful with gobies, they like to jump....
I feed everyday like clockwork when my hailides turn off... It's funny all my fish school around the top as soon as the brights turn off... thay know what time it is!!!
I feed everyday and never have a dirty sandbed issue, just invest in a good clean up crew and good flow.