I just started my second saltwater tank on Oct. 19. It is 28 gal. I have lost in one week an angelfish, a clownfish, and two blue damsels. My 3 green chromis and lunar wrasse survived but I moved them to my other tank. My ammonia is zero. My pH is about 8.1. My salinity is normal. Temp is 78-80. Everything seems normal like my other 20 gallon tank which all the fish are surviving just fine in. I did a 10% water change but still lost two fish after that. I have been adding bacteria with every change/issue. What am I missing?