I have been feeding all of my Corydoras Bottom Feeder wafers, algae wafers, fish flakes and defrosted brine shrimp. The Sterbai and False Julii's did great with everything. My Pygmy's on the other hand I am worried about. I never see them eat. I add in the food a little while before lights out and they never go near it. I've even tried adding it a couple hours before lights out to try and see if they are eating, but I've not seen them eat once. What are the best foods for them and how should I be feeding them to make sure they are eating well?