Corals? If all the livestock you have is what you have listed above, then you should be ok if you can fill the tank as full as possible to the top with top-off water and cover it to avoid evaporation. I currently use Apex AFS, but before I had it, I used this:
https://www.marinedepot.com/Current...h_Feeder-Current_USA-CU08024-FIFDFEAF-vi.html
and it did the job ok. Just make sure you aren't over-feeding. If you are using manually dosed 2 part for maintaining water parameters, I would bump it to the high end before I left. Verified with test kits, of course.