firefish having trouble passing air bubble

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Hey all,
I was able to obtain two juvenile helfrich firefish and have had them now for three days. They are small no bigger than 2" each and because of this I have them in a small hang on seperator (permeable to flow) in my 55 reef (to give them special attention and feeding for a while).
They have been eating like champs and are accepting ground cyclopeeze pellets, and the occasional spectrum pellet (when they can fit it in their mouth).
My problem is that I am fairly certain that one of the firefish incidentally ingested an air bubble when feeding on the surface. I noticed this because he is swimming in a downward motion and harder than the other one. He is still eating but is their anything I can do to help him pass this air bubble?
I know that eating off of the surface is not natural for them and am planning to try and make the pellets sink from now on.
Please let me know your thoughts on this situation

Thank you,
Chris