Back story: I have had the tank for 6 months roughly. Used tap water with salt initially. Got red cyano. Used chemi clean and switched to the pre boxed ocean water at about 4 months in. In June it was time for a water change. I had just enough boxed ocean water to change it. Forgot I didn’t have those white ammonia filter rocks in my Fluval 30. I was going to go to the store next day after the water change. Got a call from out of state(mom had to be resuscitated) it didn’t look good. Immediately packed up and drove out of state to get there as she was on a vent. She is thankfully ok. Doing rigorous physical therapy, but life changing for me and my family to say the least. So tank went probably about 2-1/2 weeks with no white rocky filter piece. Came back and it was green. I waited about another week because I had to get my family in the swing of things etc. The tank is a 14 gallon. I have no skimmer. I have a black air fan in the water (one of those magnetic ones). I have two clown fish, two hermit crabs, a fire goby, two turbo snails, an emerald crab (if it is alive), and 2 corals left. One coral wasn’t looking good and died in the water change. One looked bad and then also died after the water change. I did a 90% change Wednesday 7/17, or Thursday 7/18. Water looked clearer but put water in and siphoned more out a second time because when the sand was moved there was so much debris floating I thought it would help. I had to use tap water this time because I literally couldn’t get the ocean water anywhere as everyone was out, and I don’t have access to rodi water where I live. No changes seen due to tap yet, but after putting new water in and putting the white rock filter in it was still green. I changed the white rock filter again yesterday. Water is still neon green. Tank was in very good health before I left to go out of state. I feel like the tank is cool, but it has become a complete money sucker. I feel like although the water was fairly clear prior to my trip, it was always somewhat cloudy. Never where I would have felt happy with it. Now with this water change and the corals dying.. that’s $50 or more down the drain. I’m so sad. I can’t keep pouring money into the tank and have all the stuff die. I would love to get corals cheaper to replace the ones that died as I was getting the frags from Petco. But I’m not ready to put anything in the tank until I can figure out what is going on with the tank. I added the salt. It is at 35 in terms of salt. I also included a pic of one of the coral frags that died. The other one just disintegrated. Please help! Pics below.