I already have water and 3 damsals that have been in here for 3 months. I want to know about putting carbon in there and gfo, I probably should have been more specific, I heard that gfo takes out phosphates but then you need to add it back. I watched yt videos but it would be easier of there was a list of basic things I need. I also know corals need calcium to grow and I'm not sure what the number is or how to reach it. Sorry if the questions I asked was obvious I just was trying to learn from people with experience .
What kind of damsels are they?