Im worried about my opaline gourami.?

a few days ago i added a male opaline gourami to my 30g tank. it was shy and didnt eat anything that day so i just let it be. the next day it wouldnt eat anything i gave it. flake, small pellets, micro pellets, bloodworm, algea disk, and even tried frozen blood worm. i have tiger barbs in the tank with it and they have left it alone. the color of my gourami is nice and bright better than at the petstore. same with all my tigers. i was thinking my tigers were eating all the food and not letting my gourami eat. thats why i tried the small pellets. they are too big for the tigers to get in their moulths so they cant eat all the food. all this food was either omega 1 or hikari. the store fead this fish omega 1. i also had some snails in the tank that have vanished i think the gourami ate them, and live plants. im not too worried about the wealfare of the fish right now cause the color is good but later that might change any ideas?