Suffering D. Loddigesii?
 

Hey there, I've got these 3 D. loddigesii keiki From a friend 2 weeks ago and I've just noted that the lower leaf of one of it is yellowing and dehydrating:( should i worry?
http://lh5.ggpht.com/_Jlb5jWeA93Q/Sg...0/DSC01709.JPGhttp://picasaweb.google.it/LouderTH/...94504828028290

One has got a new leaf, another one seems to be a little bit ticker and this one with yellowing leaf has a growing bump that i'm still waiting to know what it's.

I cant provide much light but it's getting 80% RO, 70F and plenty of air movement. I mist it every morning and roots stay green for several hours:help