Feeding Randalls goby

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I have a fifteen gallon tank with one yellow tailed blue damsel a randals goby with a pistol shrimp and various other clean up crew including a cleaner shrimp.

I've had the goby for a week and a half now and have not seen him eat. I understand that he should take frozen misis or brine shrimp. The problem comes with trying to get some food near enough for him to eat. Pretty much all the food I put in the tank gets eaten by the cleaner shrimp and damsel. I'm scared to put too much food in because it will foul the water. I tried getting some food close to the goby with a pipette from a test kit (it was clean, and only used for food) but as soon as I came near, he darted into his cave, and the cleaner shrimp came and cleaned up any misis I put outside his cave.

I see lots of pods flying around the tank at night, and am hoping he's getting something to eat. He doesn't look emancipated, but I just havn't seen him eat.

Any suggestions?

should I just not wory unless he looks skinny?