Welcome!

Yes you should defiantly get them each their own home, if you look around int he GB husbandry area you'll see a huge amount of posts addressing the reasons behind this. I'm too sick to go try and find the one i read last night(flue i think ), but it was a great thread.

The advice I would give you, be very careful taking pet shop advice. I'm not saying that there arnt good shops out there with people who truly know and understand the animals they are giving advice about, but there is also alto of fodder. They might be out of UT H's so they tell you, "Hey just get a 150 watt light instead for your 20L." (True Story)

So get advice, but check, double check, and triple check that advice.

Happy Herping!
"The Dude" abides....