The above was found in my good buddies refugium tank. Its roughly 2 and a 1/2 inches long with tenticles coming out of its side's and just appeared.
A few facts about his tank
Its only 15 gallons and is just a refugium not attached to anything with no fish just a couple inverts.
The tanks main purpose is the production of copepods and cheato algea.
Nothing has been added to this tank in almost 11 months the last thing being cheato
A number of hitch hikers came with a piece of coral donated from a member of this club quite some time ago but up until now nothing like this has ever shown up
Any idea