you might want to ask for an extra few bucks each month if you could feed the fish yourself. That would save a lot of heartache.
My last account I had threw in 30 damsels and two tomato clowns on top of a sailfin tang, flame angel, purple pseudochromis, pink spotted goby, engineer goby, candy stripe cardinal, ocellaris clown, and a few others. (225g tank). Then they made the tank snow in flake food six times a day (keeping the fish fed) and when the tank broke out in a serious case of cyanobacteria they blammed it on me, and I lost that account. After I had advised them not to do that and that the tank needed more funding etc. etc.
Oh well, good luck to yah! Taking care of aquariums in businesses is a PITA.