Changed my light and I have yellow diatoms?

[jciwlsn]

I thought diatoms were brown in color, but this is more yellow than brown. I'm having some cyno, but not much. Any ideas on why it's yellow?

[jciwlsn]

Well that explains it. I just got home and took a good look at my tank and everything looked yellow. I hadn't changed the actinic in a year and can't believe I just wasn't paying attention.:rolleyes: Although I don't think I like the ultra actinic, too purple....