My caulerpa is looking all better! No more whitening and I’m getting some new growth. I already see why I am going to have to stay on top of trimming it back! I am loving the look of these little palm trees in the tank.I have the same problem with my new Caulerpa. In addition it was eaten by some worms and slugs. I have removed quite a few of these. The leaves are turning white overnight. It seems the die off may be slowing down as a new leaf appeared. I do not know if it is the acclimation to the new environment, the severe attack by worms and slugs or the lack of nutrition that caused it. I do not have any fish in that tank, I just transferred the water from my FOWLR tank. I will follow to see if you solve your problem. The red macro are faring better, but yes a lot of the red grapes fell off.
My red grape botryocladia is looking unchanged. Which I suppose is a good thing… once it’s settled hopefully it will start growing in.
How are yours doing?