I have a 10 gallon aquarium that has been set up for about 7 months now. I just put 3 ciclids and just found out a very bad idea, a dragon eel into the tank. The dragon eel has been nibbled on by the ciclids and is now missing his top fins. But the big problem is there has been since than a rapid growth of a red rusty looking algae has grown on the gravel and decor in my aquarium. My pet store said it was algae, I never heard of red algae before. What causes it and how do I stop it. I'd appreciate sme help!!!