I've been having a hard time lately getting my wild trilineatus cories to eat. I drop a few Ken's sticks in the tank hoping that they will eat it. All my other tetras hog the sticks. After 5 minutes, I take the sticks out as I feel the tetras are being overfed. Their stomachs get enormous. That leaves the cories unfed. Sometimes 2 or 3 cories have gotten to the sticks and have eaten. The others don't eat at all. I've even tried bloodworms and they don't eat any of those. Any suggestions on how I can get food to the cories and how I can get the other cories to eat?