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I have had my reef tank up for about 5 months now and all of a sudden i am getting brown debris and a wierd purplish web-like subsatnce of the sand... all my parameters are where they should be! Also a brown algea substance is growing on my rocks!!!! Please help!
I had something similar could be the same thing red slime algae took a month to clear it, I sucked it up with gravel cleaner comes back pretty quick though but will go eventually, caused by high nitrate levels
Well, the pictures have a lot of noise, so it's kind of hard to tell. From your description it sounds like you have:
1. A diatom bloom
2. Red Slime/ Cyanobacteria
Well sadly i had no clue about the dangers of tap water... well i used tap for a while and about a week ago something went wrong and the tank "crashed"... i lost all my coral and two tangs! Now i use RO/DI water!!! And its just on the sand!!! Not on the rocks at all