dead fish?

[MikeInToronto]

I don't know what your pink fish is but is it possible the anemone ate it?

I would do a thorough search for the fish but I wouldn't disrupt the rockwork. If you can't find it, chances are it was eaten by something in the tank. As long as the tank is established the spike will be small, even in a 14g. Disrupting the rockwork will cause more harm than the dead fish.