Over filter your tank and add fish slowly. You be suprised what can fit in a tank. I had a 10g with 5 tetras, 4 guppies, 3 Cory cats, African dwarf frog, 3 japanese algae whrimp and a butterfly pleco. More fish means more filter. My 60g filter pumps 400g per hour and I have 2 plecos about a foot, 3 other plecos, 3 laser beam Cory cats, 3 Julie cats, 4 tetras, 2 guppies, 3 Japanese algae shrimp, African dwarf frog, horseface loach, 2 large discus. I only do a 10-15% water change a week, and my water tests are perfect. Just add fish slowly, and make adjustments along the way. I've taken other steps besides filter to manage the bio load with minimal work on my part but the filter is the biggest part of poop management.