im having a hard time getting new fish to adjust to 84 deg.(discus tank). when i first set up i started with 3 singapore shrimp, 1 baby arowana, 1 baby bgk, 1 fallawela and 20 neons. i let the tank cycle for about 2 months then raised temp to 84 to prepair for discus 9 of them. now all of those fish are vary happy and healthy but i have been tring to add another fallawela and more shrimp but they dont make it 1 day. water prams are all good. when i bring home new fish i do standard float bags for 15 min let in some tank water and float another 15 min and let go. do i need to do somthing diferant.