Hi, my 55 gallon tank is currently home to 6 Red Irian and 4 Lake Kutubu Rainbowfish, as well as some Platies and Zebra Danios. Eventually I plan to move the danios and some if not all of the platies into my 20 gallon tank, and then I plan to add some bottom feeders. These are what I am considering: Zebra, Polka Dot, or Yo Yo loaches. Leaning toward Polka Dot loaches at the moment, probably a group of 5. OR Black Red Tailed Shark. Yes, they're territorial, but can anyone deny they look cool patrolling the bottom of a tank? Right now the bottom of my tank is practically empty. The Rainbows and Danios hardly ever go down there, and there are lots of hiding places (fake log, natural caves made from driftwood, fake plants) so maybe it could work? I realize it's hit or miss with RTS and some are just ornery regardless of these conditions. OR Bristlenose Pleco. Kind of boring compared to a fun school of loaches or a cool Red Tailed Shark. OR Something else? I'm open to suggestions. I already have Corys in my 20 Gallon so I want something different for the 55. Basically, the mid to top of my tank is busy now, but the bottom of my tank needs some action (preferably not just nocturnal action). Opinions? Thanks everyone!