Hmmmm ... I have a female that is @ 1600g that has always been a fast aggressive eater but just recently started doing this exact same thing ... She will actually come up and lay on top of the feeder like she is guarding it after I leave it in the tub after she refuses while I feed everyone else but then I come back to her 30 min later and she still just laying beside or on top of it .... I am just chalking it up to a seasonal fast tho seeing as how this is her first mature breeding season ..... I'm going to take the back seat now ... Hopefully some of the senior members can help ya out a lil more with their experience .. good luck