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That looks like a baby Rhizotrochus. They are Non-photosynthetic and need to be fed.If that is what I have I believe you will be ok. Just spot feed every now and then and they will get everything else they need from the tank...

They do have blue/green specks under the blues. They are some of my favorite hitchhikers I’ve gotten/noticed so far.I have a hard time distinguishing Rhizo's from Balanophyllia but it looks like they are all either of those.
I don't think they would color up (unless already colored) because they are Non-photosynthetic and don't have Zooxanthellae.

