Tom :

If the LMB look to be in good condition then I would not worry about it. Bruce and Bill have posted (I think on the yellow perch thread) about differences in food and there are other posts on it also. If you do a search under feeding you should be able to find them.

link
http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=000379;p=8