This hitchhiker showed up after I added some snails from KP Aquatic. They grow a fan like some tall green fanworm, then it turns into a circle, then a single lobe. The lobe turns white and stops growing.
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Thanks flsalty, so it was the KP Aquatics FL keys order hitchhiker, and not the indo zoa order. Very interesting read. An algae and one of the largest single-celled orgs, can grow to 3". This will look neat as a contrast amongst the usual tank coral once they grow in.Acetabularia crenulata
typical emeraldsWas eaten entirely by an emerald I had to get for Valonia control. It prefered decorative macro.