My electricity was turned off today from about 9.30 am to 3.30 pm. I rang the aquarium shop and they said that I should treat my tanks for white spot because the change in temperature might cause an outbreak. The temperature is usually about 24/25C in the bigger tanks and about 25/26 in the bettas' tanks. It dropped to about 21C. Is there anything I should do now? Should I medicate the tanks against white spot as suggested? Thanks.