My favorite plant - just don't move it
Purchased elsewhere (started out as a tiny 3" plant and grew slowly but surely in a lowtech 90g.) Was really an eyecatcher until I decided to move it one day. it did NOT like that. No matter what I did, the plant just kept dying until nothing was left. I think in the move I smothered the roots somehow. In any case, my advice is to be sure you plant it exactly where you want it and leave it there.
***update*** just received my order from this site and they are in amazing condition. My only complaint is the rock wool used. Not only is it environmentally unfriendly but it is also a pain to remove from the roots. other than that, I hope their transition to submerged goes ok.