Yeah, I had a species of seaweed just show up on me, it was halmeda...If there is a spore or some of the root left behind it can regrow... I let mine grow for a while then moved it to the places in the tank that I wanted it. I prune it weekly and only allow it to grow in the backs and a couple stalks throughout the tank. Personally I think it adds to the asthetics of the tank as it looks more natural and the fish that I have really like it, plus caulerpa can be extremely beneficial in the removal of waste in the water...Caulerpa can actually be beneficial in your case because it can out-compete a lot of the lower life form algaes such as hair algae etc, if you let it go for a while you may see the hair algae start to subside...If you really dont want it just pull it out.
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46 bow, Aquatinic tX5 lighting, Remora pro, maaaad softies, a few gobies.
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