May be this exposure is lethal to my Calladium, it was exposed to UV-C for about 10 hours, i was planned it for just half an hour, but I forget and I was doing something else. Half an hour exposure is enough to make this only two leaves Calladium changing its color to a bit yellow and dark green and totally dried three days later. The ten hours UV-C exposure the plant has already recover from the first exposure and it has four leaves, the result is almost the same, two leaves was dried out 4 days later, one leaves six days later and one is still survive with the color altered by bright yellow spots and it could still maintain its surface shininess not like the other three, and after the two leaves die, it produces one new leaves which is has more yellow tone. The next exposure will be on Sansiviera Giant with two leaves.