[Michael Hoaster]

I think Ulva is almost universally loved by all herbivores/omnivores. My tiny Dove Snails go after it big time. When conditions are to it's liking, it can often outpace predation. But those conditions are not ideal aquarium conditions, so they eventually succumb.

This also brings up the question of 'editing' down tank critters that may be competing with your own goals for the tank. Sometimes, we get something small, and it fits right in. Later, they get bigger and too destructive for the tank's ecosystem. In the meantime, we get attached, and instead of removing it, we allow our plan to get hijacked, essentially giving up control of our intended goals. Is this crab doing that?