I have 2 clown fish, 1 file fish for aptasia temporarily, 1 Benghai cardinal fish, and a 1 cleaner shrimp, and royal gamma. I have one cleaner shrimp. My corals are on AB+As other have mentioned I think it depends on your inhabitants. For instance I wouldn't leave my mandarin for a week without food but wouldn't be as concerned if I had a huge pod population for her however I would still buy an autofeeder. Also, given we try to make our tanks biodiverse, it's possible some inhabitants will become meals for other inhabitants (just like in the wild) if they're not fed. If you get an autofeeder then be sure to buy it well in advance of your trip so you can test it to make sure it's working as expected and you have time to make adjustments if needed.