2 of 4 anemones bleached. Why?

[D. Torres]

Here is the short version. I have 4 anemones in my tank. 2 are doing really good and the other 2 seem to be bleaching out. Why?

Long version (if you're still interested in helping me):
I have 4 anemones. Two are rose bubble tips and they have been doing great for a few months now. The two other I believe I green BTAs. They both had great color at first and now seem to be bleaching out. Why could that be? I can't figure it out since 2 are doing really good and the other 2 aren't. I have a 75 gallon tank and my paramaters are stable. I recently started dosing NOPOX to lower my phosphates because they have been about 0.35ppm and I want them lower, but I can't say that's the cause because they were starting to lose color at least a month before I started. Nothing else has changed. Any suggestions/advice? Please help. I have attached pictures in white light so you are able to see the colors without the blues. And one picture of how the one anemone used to look like.

 

[EmdeReef]

They’re changing color, which isn’t uncommon, but don’t look bleached to me.

Sometimes light changes or temp swings will drive pigmentation, could also be nutrient related.

As a side note - nopox is not the best way to reduce phosphates. You’ll end up stripping nitrates and have small impact on phosphates. The imbalances can lead to cyano. Use GFO or Lanthanum if you want to lower phosphates.