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cardinals question

hi all,
i recently set up a new tank. the filtering is UGF and eheim system. The
plant i use is all java moss. Lighting is 1 40w bulb ( after all, i use only
java moss ).
My question is : for a past few day , my cardinals seemed to be ghatering in
the upper part of teh tank. I never saw cardinals swimming around in the
upper layer, so i think there might be a problem. the other tank mate is
only a otto and an inch-long discus.
anyone can help ?