I am going on vacation for 5 days soon. I am worried about feeding my fish while away. I do not have anyone available to come over while I'm gone. I'm also wary about auto-feeders- if they malfunction my tank is doomed Should I bother with the vacation gel blocks? Would they be fine without food until I return? If they won't starve, I think I'd rather keep them a bit hungry rather than put something new in the water that could cause issues.