I used to have a small peaceful freshwater aquarium. in that aquarium I had a red clawed crab. he liked to climb up into the filter and eat fish poopie and rotten foodstuffs off it. because of this my filters always lasted about a month longer than normal. so now I have a 55+ aquarium in which a red clawed crab would be a light snack. so i am going to purchase a red clawed crab or even a little female fiddler to live entirely in my filter. see if it helps..
