Macroalgae Die-off

[o2bnh20]

My fuge was over-run with flat Caulerpa algae. So I got rid off just about all of it but I kept my Cheato algae. I put some Feather Caulerpa and several other types of green and red algae and all was well for the first two weeks since I re-planted my fuge. I go to look at my fuge last night and notice that about 80% of the new feather Caulerpa has turned yellow and is dying. All my water perimeters are like they usually are:
ph=8.2
No3=0
PO4=0
sg=1.024
Alk=10 dkh
Cal=400ppm

It's a little alarming that it's dying off, I've had good success with my macroalgae since I started my fuge a year ago.

Any thoughts why this species is turning yellow. All my other macros are growing and looking good

[o2bnh20]

no thoughts

[waterdog1]

the EXACT same thing happened with my feather caulerpa. It grew like crazy, the melted away. Maybe my tank was too clean for it? It was wierd