Question: Black fungus taking over tank!

[tdavidr1]

Hello. Recently, I have been having trouble with some black algae in my 20 axolotl tank. Some kind of black algae or fungus has taken over the tank. Its all over the walls, on my rocks, and on my driftwood. The tank recieves very little sunlight Thisitself is not a huge problem. The problem is that this algae stuff is clogging up my filter. This reduces the flow of my filter, and has rendered it useless. Now my ammonia is rising, and im not sure what I can do to fix all of it. Any help would be appreciated

Edit: Picture of fungus/Algae

 

[Otterwoman]

If it's taken over it's time for a tank change. Scrape it off the walls, scrub everything in the tank, scrub the tank , start over with just the axie. I don't know what causes it but if you can find out then change the cause (light?) .
If no one here can help you, I googled "black algae in aquarium" and there was quite a bit of info.