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I think it's a matter of necessity. For a new cycling tank....nothing, just some sponge/floss to catch the junk that'll be floating around.
Later on when some fish are added, you could go with carbon just to keep the water clear. That with a skimmer should hold you down for a while.
I never hear of a six line attacking inverts, other fish yes but snails and urchins no. Maybe some folks have had other experiences with them but mines never did.
I'm a big urchin fan but without a stable algae food source , it'll eat your coraline. So if your attached to it, then I'd say no on...
Its DIMS (36” x 15” x 13”) so it seems long but pretty shallow....which I feel is a good thing. Give you easy access to the tanks sandbed and what not.
Something like this is what I'm referring to. (Pic I found off the internet)