Branching grieth

GHogg

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Hey! Just got back from vacation and checked on my tank. Noticed these semi-transparent (maybe purple?) branching organisms on my rocks.

initially I thought bryopsis, but it doesn't seem furry and seems more smooth and almost tubular. I have no clue the timeline for growth, but none of these were visible last Tuesday when I fed my tank.

The first picture shows the biggest right in the middle laying across the rock. There's several sprouts in a group there. The other picture shows a smaller one in a different spot on the same rock. I didn't use any live rock, and it likely would been introduced along with the urchin I purchased the weekend before last. The tanks about 3 months old.

How aggressively should I be searching and destroying?

Thanks!

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