One of my Orandas doesn't seem to be eating. What can i do?

I recently bought two orandas on Sunday. I have a Cold water BiOrb with 7 minnows and 2 fantails. I give them flakes and pellets everyday. The two fantails eat both ok. The two orandas on the otherhand seem to not know what food is! lol. 1st they only ate the flakes that sank towards the bottom. now one of them has... show more I recently bought two orandas on Sunday. I have a Cold water BiOrb with 7 minnows and 2 fantails. I give them flakes and pellets everyday. The two fantails eat both ok. The two orandas on the otherhand seem to not know what food is! lol. 1st they only ate the flakes that sank towards the bottom. now one of them has learnt about the pellets. I'm worried about my other orandas who seems not to be able to eat. It swims around opening and closing its mouth trying to eat the food but it never seems to eat any and hardly never comes for the pellets only for the bubbles and swims back down. and also it looks lethargic, just floating around most of the time. Is there any thing i can do, or just leave it continue feeding normally. Thanks for help.
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