sick anemone maybe?? need help

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the tank is about year old but i did recently change the substrate it was the crushed coral and now its the sand
how come tho? i asked like every pet store near my house and they said it should be fine since its in a 10 gallon tank. if i just switch the bulb that i have now and put a pure actinic light would that do it or do i really need to spend 100 or more on a hood?
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