Black-reddish "carpet" on my rocks

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bezbradica92

Aquarium Advice Newbie
Joined
Mar 5, 2020
Messages
1
Hello, I am new to this forum, but not new to aquarium life. I have a 350liter freshwater aquarium tank with neon tetras, cardinals, livebreeders(guppy and platies), zebras, cherry barb, cories and ancistrus.
Lately i am having problems with some kind of black-reddish stuff on my rocks and my anubias. At first it started as a spots on anubias and rocks, but now the rocks are all covered.
In a meantime i swithced from neon lightning to LED, but nothing changed, it all stayed the same.
I am really determined to solve this problem, but i hit a brick wall. Really I could use some help.
On a first few photos is my aquarium when everything was fine, and on the last photos is my aquarum at the moment with all black-reddish stuff that bothers me.
Thanks
 

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