I am getting some red slime in my 28 gallon aquarium. It isn't too bad, but I don't like it of course, and I don't want any more. What is the best method for removal? I know certain hermit crabs eat it. Would a tuxedo urchin eat it? I have a UV sterilizer, does that kill cyanobacteria? And I know there are a few red slime removal products out there, but I want to know if they are safe. I never use algaecides for my freshwater aquariums because they are full of nasty chemicals. Do these red slime removal products contain stuff like that? Thanks!