thats a good idea, they do like the company of each other I think. not true schoolers but if you see pics of more than one in a tank they are alway in the same hide or cave together. it may just be restless, give it some time and keep offering food. it is a good thing that its swimming though. maybe try offering food at night when they are really active. and plase be sure to have an extreamly escape proof hood becasue eels will ALWAYS find a way out. mine has escaped twice so far!