Found this colony in my tank that has apparently taken a graft.
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It’s not a graft by definition. As Rudy pointed out this is a common occurrence, it’s not unusual for watermelon zoas to do this and then lose the color as the polyp matures. Zoas do morph, but that would be contingent on the new polyps retaining that trait and passing it on to future polyps.The green glows under uv