Start a QT! Nothing fancy. Also don't chase ph like everyone said. Research and ask questions many people will help. Run some carbon to help clean tank.
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a three hour acclimation for a lfs fish could be the problem. I get all my fish from an lfs. I match the salinity in the qt to the lfs water. float the bag for temp and put the fish in. agree on chasing ph. nothing wrong with 8.0. stable ph is more important. dwarf angels often have trouble acclimating to a newer tank. I would let the tank mature more.