What is this on top of my chaeto?

[Mjhatley]

I don’t have any algae in my tank anywhere but this stuff keeps growing on top of my chaeto everytime it gets to the surface. Has anyone else had anything like this?

 

[billwill]

mine does that too. I think it’s from too much light in my case because it grows really fast and my nitrates are nearly zero. Partial zero as Subaru says

 

[rsumner]

Diagnosing chaeto issues has some simple symptom diagnosis:

• Light green or white in color and comes really loose = Too much light.
• Dark dark green in color and excessive clumping into a ball = Too little light.
• Brown in color = Diatoms are growing on it or there is excessive detritus. Rinse it during your next water change.
• Slimy = Die off. Time to trim.