Was he sucked up alive? I just don't see a protein skimmer doing that to a live fish and wouldn't it have some sort of screen on? I do like the diamond gobies and almost bought one awhile back but I'm going to hold off for a mandarin --- thinking of only adding 3 more fish. I mandarin and 2 clowns -- rest coral 
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90 gallon with 26 gallon sump/refugium, 2 x 250 MH lighting, 100lbs live rock, 1 - yellow tang,1 damsel, 1 - cleaner shrimp, 1 - coral banded shrimp, 3 - emerald crabs, 2 - porcelin crabs, 6 - peppermint shrimp, 1 - green ricordia, 1 - toadstool, 1 - brittle starfish, 1 - sand sifting star, 100's baby feather dusters,Ass mushrooms, frogspawn, xenia, 1 clam,
6 - Leather coral, Green star polyps,Lime green/orange button polyps,1 huge carpet anenome,various snails/hermit crabs | 
sucking goby 
