Hi all great forum, glad i have found it. Anyway my problem is i set up my tank, 55 gal with canister type filter proquatics 1600 let the tank cycle checked water then had fish store check water all was good then one week later checked water, salt & temp next morning all 4 fish dead with the ammonia sky high, what would cause this ? the water has turned cloudy i know i will have to start all over but would like to no what went wrong thanks for all info.