Quote:
Originally Posted by thoms_here
I have seen blue coralline algae just once around 2 years ago and it was a medium blue to dark blue color. She said it was slow growing and I noticed it was in the bottom of the tank where it might be a low light/deep water species. Either way I would LOVE to have some!
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I agree with this assessment. When I had beautiful blue coralline, I had it in a tank with old school regular thick fluorescent tubes. I think it was 1 10k tube and 1 actinic tube. That’s it. Low light level for sure. And, I think the actinic helped a lot.