My FC holds well and I don't have any green or mustard algae.
The black spots in the pic brush away like dust or get sucked up by the vacuum. Sometimes I think its dust that settles in crevices in the plaster and sometimes i think its black algae.
Thanks for the reply. Sorry about posting in someone's thread. Didn't mean to hijack the thread but i figured since it was in line the topic it would be okay.
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