Hi OzPhal!!

Well done, you made a good choice!
So... you bought three very young plant. Because of their little age they're extremely weak and delicate. The first thing they need is a very high and constant humidity rate.
I think temperatures and RH you have are perfect. Can you ensure a good illumination?
I presume your aquarium is closed so air is now allowed to circulate inside and this may cause severe mould attack, fatal for these plants. You can avoid it simply by installing a little fan inside that moves the air inside.
Then... what else??
ooh, yes... You should know you need a huge amount of patience, this little plants won't flower in next two years.
Patience, constancy and passion: good luck!
