Hey, have been looking through your diary..I c your temp went up to 20c but she's kinda stalled atm. Been looking at your pics and with the temp, your soil has stayed too wet and not been able to breath. Let it dry out every few days and even poke a stick through some of your substrate, will help dry it out and therefore allow air into your roots, as they need 02, and it looks like your plant is stsrved of 02, also, that pot doesn't sit on anything like stone or anything? If so, move it onto soil to allow the plant to get rid of excess water. And it'll help your plant dry out too, as I said, your substrate looks too wet too often.
Good luck.
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