foxtail fertilization

hello all,
i have a small foxtail fern which i have been attempting to cultivate for a year or two. since i got it, every new frond has been double the length of the rest, with correspondingly wider-spaced nodes, and dying quickly. my best guess is that i have overfertilized it, but giving it only plain water recently has not had an effect yet. anyone have another idea? thanks very much.
aaron brick.
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Minimal water, minimal fertilization, shade at noon.
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