New reefer looking to setup some beautiful tanks. I need advice and free neon green s

Hi my new 30 gal is full of a green haziness I need to try a filter sock... But I just out in some black non live sand. Over river rock...



I have one hermit and a Red Sea crab I'm not sure. Running 3 hang on filters at varying quantity per hour. 2 t5s need to switch to RO DI water but I also need a lot of neon green star polyps



!!!!!! Im building a meadow tank...



Need help. Help me