wild caught clownfish stop hosting :(????

Hi guys I have a question I got a pair of wild caught clownfish from lfs they are almost 2 years old they are really healthy, when I got them I put them in my tank and they hosted my bubble tip anenomes ( by the way I have 5) after 2 hours... Then after the 3 day they stopped why all of a sudden did they stop ? I didn't change anything in the tank could someone pls help me figure out why they stopped :( it's been almost 2 months now that they stopped and nothing yet