got ethical husbandry?

Chaeto

When I got my ball of Chaeto is was green. I've had a proper light on it for about 12 hours nightly opposite my tank lighting, but some of it is dark brown. What's happening?
 
Pic is worth a thousand words :)

If it’s growing well the part on top will die and turn brown or white as it gets pushed up sometimes, time to harvest.

Or maybe another algae growing on it?
 
Chaeto can also have trouble in tanks if there is too little iron. I had high nitrate and phosphate for a while and the chaeto was struggling until I started dosing iron. Now it grows like crazy.
 
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