help seting up salt water

[zuzes20011]

Hi guys i have decided to set up a salt water tank but its going the wroung way lol so i have one 72 gallon bow front tank 300 gph filter 2 power heads 1 heater 1 big air pump to t5s



so i started out by laying the crushed coral at the bttm then layed 2 begs of sand then added the salt mixed water then added base rock my tank is cloudy my gravity is at 1.021 my ph is at 8.0 to 8.5 i dont no whats wroung i had no problem setting up my small 3 gallon tank did it all in a day all my fish are fine in it besides one clown fish but i think he was dead at the pet store if you no what i mean