I have a livebearer tank with mostly guppies, a pair of mollies, a few random tetras ( i need more - a few have died), a single tuxedo raspora, an african dwarf frog, a golden algae eater and a single cory cat (one just died). I am looking for help on how to take care of the scavenger part (although I would welcome other recommendations as well). I see other threads have recommendations to put in 6 corys. Is that right? Will there be enough stuff in a tank this size for them to even eat? Are there other appropriate scavenger types that might be a better choice? I would like to stay away from anything likely to make meals of the livebearers or fry....