Indeed, toptank has the toptank when it comes to coralline algae. I have been trying to achieve something like that, with spurts of success. Unfortunately, my coralline algae doesn't look close to yours.
I have often wondered why I need to supplement strontium to get mine to grow. Obviously, some people don't need it. I just see a huge difference when I do.
I also use a 2-part calcium additive (Restore).
I just don't get it?
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