On Saturday I added an azure damsel to my 20g reef. The tanks has been going since March. The only fish that keeps surviving is a black Molly. I have some LPS and SPS, 2 snails and a blood shrimp. All are doing well. My water is fine, but the damsel went missing between yesterday and today. No trace anywhere. I checked all around the tank, nothing could the Molly have eaten it? I’m confused.