I think it was from feeding my gar...I used to power feed him, he would eat like 4 goldfish a day... the last time i boguth a dozen feeders he ate maybe 3 of them...then 9 of them just sat there i thoguth he woudl eventually eat them but never did...so i just gradually started taking them out over the course of a month...thinking maybe he woudl eat them....i took the last 4 out today...i think that was my mistake :X