I have a 20 gallon tank, cycled, that currenty houses 6 tiger barbs and 6 zebra danios. I want to put in some form of algae eater, and am thinking perhaps a bristlenose or 2? However, I am thinking that that is going to be pushing the tank's capacity based on the adult size of all the fish involved. To those that have been at this awhile, what do you think? Go for it and just monitor the water, or are there different algae eaters that might put less of a load on the tank? Algae has not been a major problem yet, but I do see signs of it when I am cleaning, such as green film growing on the light "lens" portion of the tank cover, and I want to stay ahead of it.