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I have certainly seen shell disease in small O. s both in the lab and in the field. Because smaller O.s. molt fairly frequently, they are more likely to keep ahead of it, but if conditions are not optimal and/or molting is slowed, it can be lethal.
I don't try to push any particular product, but we have used Selco for several years as a supplement. It has a lot of fatty acids and vitamins. I sure that many other feeding supplements will work just as well.
Roy
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