Hi Everybody I manage to put together a video that explains my tank and I also have written on this post kinda what happen with the tank. I really need some help. I am not sure if I have setup everything correctly and if my water parameters are ok or if I take them the right way. I live in San Francisco and it would be good if somebody can come and check everything. I have a 75 gallon fish tank and a skimmer with a 3 room refugium (I am not sure if the skimmer works how it suppose to work. I see bubbles and everything but not sure how it should be exactly). I also have a wave-maker and not sure where would be a good place to place it to not disturb the corals. I think I even killed 2 trochus snails I have no clue how they died... They felt from the glass then I think they ware not able to turn and when I turned them they ware not moving anymore. I recently bought like 12 corals, and all the corrals frags are closed. Not sure what to do anymore. And it's been like 12 day's since they are close they want to open a little then they close. I think 1 of them died already not sure about the rest. I have to say I watched over 60 hours of youtube videos but still not sure if I have all the prices correctly. I have attached some pictures so that you can see my tank. I really spent over 90 hours in the past 4 weeks to prepare everything and arrange everything, and I don't know what to do anymore. Here is a link with a video that I just did that shows you my tank: 1) The saltwater tank was setup on 16 of December 2018 - I had over 50% of the original tank water and the live-rock & sand was there from the previous owner. 2) On 24 Of December I have added 10 Corals mostly all of them ware Zoanthids. 3) On the same day 1 of the corrals did not had a plug and my wave-maker blew the coral away and I had to move my rocks to find him. After I moved almost half of my rocks I still did not find it and then I took my wave-maker and I blew the corals from the rocks but a lot of sand got moved in the process. 4) When I placed the corals in the water they got acclimated and I had a few of them that opened up. 5) I also did some water tests but I did them wrong and I start dosing magnesium and calcium and that was bad. I think now they are still higher. Not sure why my but alkalinity is high as well. See my current readings on the link bellow: https://www.aquaticlog.com/aquariums/axelavi33/1/parameters. 6) After I placed the wave-maker back to his position it dropped and I was not home and it blew a lot of the sand from my tank until I got back. 7) I did like 20 gallons water change on 12.28.2018 but I see my Calcium, Magnesium and Alkalinity are still high. I had a shrimp in the main tank and it was alive for like 2 weeks but it died on 1.3.2019 Overview links: Here is a link with a video that I just did that shows you my tank: Here is a better video of my corals: Zoanthids coral image: - Not sure why the coral skin looks so bad and wrinkly. https://drive.google.com/open?id=1Rak-06Dkbd4VWIrETMRhraP-Jju58o3J Fish Tank Image: https://drive.google.com/open?id=137dyull4Ypp4CDtFCfLxF1olbELgvIlU Sum Image: - is the foam to tick or am I suppose to have it lighter? or maybe is not good like this. Maybe in the video shows a better view. https://drive.google.com/open?id=1lthwi2x7J8Dx7Zxetm8QpbJGXYoXS_AA Here are the water parameters that I have: https://www.aquaticlog.com/aquariums/axelavi33/1/parameters I also have a 10 gallons quarantine fish tank. Thank you! Please let me know what I can do to improve the quality of my main display.