Yup, that's right.
It's confusing, though, because there's a difference between "extending" and "reaching".
For the most part, extention describes healthy polyp feeding/expansion behavior (there's a bit more to this where it gets confusing, but that's beyond the scope of this post, atm).
Polyp reaching is where, like jkhchris said, a polyp is physically stretching as much of its body as it can in order to acquire more light.
Hope that helps.
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This and that.
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