My scenario: 10 GL, freshwater, 1 platy, 2 guppys, 2 corydoras.
As you may know, platys are famous for pooping. A lot. I didn't think guppys were though. Well, basically my tank floor gets covered with poop every 2 or 3 days. I'm certain I'm not overfeeding because I feed for less than 5 mins...