Cochlioda noezliana failing health

[tmaxwell]

HI everybody,
I'm basically wondering if anyone grows this, and could give me some advice. I got it about 9 months ago, as a cutting with 5 or so back-bulbs, and it started growing profusely in my tank. It had 5 new growth fronts, looked really great. But, before any could mature (about 4 months ago) the leaf tips yellowed, then browned. The new growth slowed to a standstill, outer leaves yellowed, roots started dying. I thought overwatering, but it's got such fine roots, and I let it dry pretty well. The only thing I can think is temp. Daytime temps in midsummer were in the 80's, which I know must be pushing it, but could that really have such an effect??
thanks for any input,
tyler