Daphne, IMHO do NOT let him use the little pyramid thingy... They're garbage for even freshwater (IMHO) but for salt, I believe they even have a PH buffer in it which would NOT be good for saltwater.....
I know this isn't the best way to do it, but during my "ignoring the tank" phase of the last few years, I'd go 2 or so weeks between feedings of the tank, and the clowns made it through that just fine...
And, as always, no NOT recommending you ignore your tank and put your critters through multiple weeks at a time of starvation, but they generally can take it...
It helps if your tank makes some of it's own food too... ('pods, etc) for the fish to nibble on...