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Usually means you have to many nutrients in your water. What are your water parameters, what type of lighting, and how long are they on? What's your water temp, how often do you feed your fish, etc.
Don't have a water tester yet getting one next time I got to the pet store. I feed my snowflake eel once a day I piece of shrimp and my fish about twice a week. My lighting is in the pic.
I would suggest you cut your lighting to 8 hours. You could also siphon some of it out of your tank. You need to get a test kit for your tank. Your also gonna need to do some water changes more frequently to help kill it..
Here's a link to help you to getting started
Me and 3 of my friends had same, and it went off all our tanks within couple of weeks, 1 of them didnt even have a fish or any live stock in tank, how long your tank been running for?