Hi, about the dying fish, I recently treated my thank for hexamita disease and raised the temp to 93 (tetras were not to happy) one day the sun joined in and I found my tank at 98: discus and rams were fine, but the tetras, corys and farlowella, borneo sucker, were all dead. The tetras were the one who seemed to acomodate the less (at first) of the temps. live and learn! malem