Can someone please help me out my tank is 8 month's old and diatoms are taking over they are getting really thick and when I scrape them away they come back with in a couple day's I've been dealing with them for month's now being very thick kind of irritating have been patient but they still won't go away my nitrates have been at 0.0 for a while now could that be a factor any help is appreciated want too get rid of them and enjoy my tank