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Also, what's your magnesium level? Low mag can slow growth even if everything else is perfect. Aim for 1350–1400 ppm if you're not already there.

Blastomussa can be slow growers, especially if they're not getting enough nutrients. What's your nitrate level? They prefer 5–10 ppm. Also, try feeding them directly with mysis or reef roids. I've seen mine respond well to target feeding twice a week.


Agree with this. Mine didn't grow until I ...