Yes, I think there were some at the edges, like the hairgrass. It's been a while back, over a year ago since I had any of those tanks. My present tank is a 90 gallon with fancy goldfish. But I just purchased a small vintage tank off ebay, and am thinking about how I want to set it up. Not sure yet which way I want to go. For a bit I kept some blue mystery snails in my present tank. same problem...poop like crazy! I gave up. I still have one lone olive nerite I have had for years...can't let him go.