It is a normal part of the "cycle" process of a saltwater tank. You are getting green micrcoalgae on the rock. Do you have any snails or hermit crabs as a "clean up" crew?
What is your Calcium level?
You may have been a little early adding fish to the tank, but damsels are very hardy fish. You may encounter problems adding new fish to the tank since damsels are very territorial.
The red centipede is probably a flatworm but a picture would help ID this invertebrate.
HTH
Doug
What is your Calcium level?
You may have been a little early adding fish to the tank, but damsels are very hardy fish. You may encounter problems adding new fish to the tank since damsels are very territorial.
The red centipede is probably a flatworm but a picture would help ID this invertebrate.
HTH
Doug