Emily I've got one I've had for at least a year and a half and another that I've had about 3 months. I keep them in the darkest area of the tank, I think the problem with them is that algae will grow on them very quickly. I've kept them in caves etc and the only time I've had trouble with them is when the are close to the light.
I don't spot feed, and other than keep them out of the direct light I don't do anything special for them.
Doug
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