A Quick Question

[furry catfish]

Hi,I bought 4 male endlers last sunday but now i decided to trade 3 of them in to get 3 female endlers, but one of them is acting strange,he drifts away from the group when I am watching from a distance and when I get closer he slowly swims away and rests behind the filter or under the log,the others seem fine,I have cycled the tank and the ammonia nitrite and nitrat are 000.Is he just still suffering from the move or is it somthing else?



thanks