Hello!! I am pretty new to the whole aquarium/fresh water fish thing, but my kids and I wanted a nice tank for Christmas, so that's what we got! I have a 20g aqueon hexagon tank. The water cycled for about 3 weeks, and on New Years Eve I put in five platys. They seem to be doing well so far, but I was wondering when I can put a pleco in? The guy at petsmart that tested my water said I can add one now, but I need to have algae wafers. Just wanted some advice. Thanks!