So you're on KT and you're having problems healing the Frost Tombs. Then a simple change in Grid will help a lot!
This is how you do it:
Step 1: Download Grid and do some basic configuring if you want to.
Step 2: Type /grid config or press the minimap icon of grid.
Step 3: Go to Status and then Auras
Step 4: Under debuffs write in Frost Blast (thats the name of the debuff)
Step 5: Under Auras you should get a new tab called: Debuff: Frost Blast. Change the color to something that you can see easily.
Step 6: Under frames go to Health Bar color check on Debuff: Frost Blast.
Step 7: Close grid configs
Step 8: ???????
Step 9: PROFIT!
Hope this helped you!