Will raising the water temprature in a marine fish tank kill white spot?

my local marine shop told me to raise my temp to 30c 85f for around 5 days as white spot cant live at that temp is this true also will the temp kill my corals or fish i have 3 hard corals and 4 soft corals and 3 fish powder blue tang, yellow tang and a clown fish several shrimps, snails, starfish,and a sea urchin... show more my local marine shop told me to raise my temp to 30c 85f for around 5 days as white spot cant live at that temp is this true also will the temp kill my corals or fish i have 3 hard corals and 4 soft corals and 3 fish powder blue tang, yellow tang and a clown fish several shrimps, snails, starfish,and a sea urchin and hermit crabs and an some kind of white annemone
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