Tank brown spots

[Giancarlo_Flex]

So I have had my tank for about a month now. Usually had light on for only 6hours a day but started to leave at 12 a day. Just noticed these brown spots in my tabk, remember someone saying “ugly” stage of tank. Anyway to remove/prevent this. Any seachem products??

 

[Magic031707]

Diatoms. Normal for new tanks. They will come and go

 

[Lavey29]

You are going to be experiencing a variety of ugly phases throughout the course of the first year. 12 hours light is to long for a new tank with minimal coral.