Hi, I'm new to saltwater tanks. I have a tank set up with live sand and rock that's been cycling for about 3 months. I'm scared to add anything. I got a brittle star with the tank that died not long after I got it. I don't want to repeat that experience. I'd like to just have a reef tank that maybe I can add fish to later. But I have no idea what I'm doing. I've read a lot about setups, refugiums, water exchange, etc. i just have a 40gal tank with a filter with light filtration and bio balls. I have a good testing kit and hydrometer. Please give me some tips on starting to slowly add life to my aquarium. Thanks!