I have a 55 gallon saltwater tank w/ live sand. We didn’t get live rock because I’m not interested in having a reef anytime soon. So I have let it run for about a month fish free. The other day my fiancee bought me 3 small yellow tail blue damsels. Well we brought them home and aclimated them for the legnth of time the lady told him and one of the fish acted strangely and the next morning was dead. We feed the remaining two live brine shrimp and the seemed to be happy and healthy in their new home. Well to my dismay another one is dead. We’ve checked the levels and everything seems fine except the pH it’s roughly 8.8 could this have caused my fish’s death? What should I do now?
Thanks