I like my plecos? I have a 14" in the 180, do I have to vacuum his rope poop up every week, sure. but he keeps my wood glass and rocks cleaned up, fair exchange to me. I keep a 12" in the lutino tank. for same reason. that tank in a window. no back ground and no algea. I do throw him in the jag tank for a few days every 3 weeks or so to clean it up. then back in the lutinoes tank. for bio load not that bad, fish poop is not bio load in the water persay. your biggest bio-load is your fish by way of respiration. they pass ammonia to the water much as we pass carbon dioxide to the air. un eaten rotting food is also a big contributer but no where near as big as the fish itself.