How do can i tell if my pleco is male or female as i can not find much infomation about them, it is a L155 about 9" long from head to tip of tail and i have have had him for about a year, i dont intend on breeding it i was just curious to know its sex, it is in a 450ltr tank with 2 oscars (about 8"), also will it eat any sort of fresh fruit? I normally feed it alge wafers and cucumber.