Frogfish behavior

Question
Hello,
I have a frogfish that has been doing well, but all of a sudden, over the last day or so, the frogfish has been swimming around the aquarium and floating with the current.  He'll perch for a short period of time, but then begin again to swim around.  He has eaten, so it is not hungry.  What could wrong?  I have two other frogfish in the aquarium, and they are dong fine and behaving normal.

Answer
I am not familiar with anglers other then to say I love the way they look.

I will assume that all water parameters are ok.  And that you havent changed the routine or anything.

But other then the those issues, I hope you find out what is wrong, and please let me know what you find out.