The tank has been set up since Jun 05. Test levels are NO2 ,0. NO3. 10, NH3. 0, PH 8.3, sal. 1.023, temp. 80. the helthy fish are a flame hawk, Two clowns, c.c star, eng. gobie, and yellow tail damsel. the new fish that die all go the same fine for two days then gasping followed by death on...