it should be back to normal, my albinos sometimes have similar things happen, but give it a couple days and it will disappear. It may be they hit them selves onto glass or hard objects in the tank. Bichirs are fast in their recovery.
Completely agree with garniac,its down to them either thrashing about in the bag or the net in the lfs or yours if you netted him or just bumped into the glass as they somtimes do.
i concurrrrr.... might even heal sooner than a couple days. youd be suprised with their healing powers...not as good as the legendary sharks healing powers but close...