For the past 3 months or so my tank keeps getting diatoms over and over again and the just wont go away, my tank cycled like 5 months ago so i dont think it’s because of cycling, I first started vacuuming the gravel and cleaning the glass to see if it would go away after i did that for a while but that didn’t work. Ive just been leaving it now to see if it would go away on its own but after a month it hasn’t. My tank always looks nasty now because of it, what can i do?

