How big a tank for 2 T. Dobrogicus?

[damien]

I think the title says it all

They currently live in an icecream bucket of about 20*10*10. They are morphed etc.
They can't stay in there forever, and I want to give them a better home.
A tank of 40*20*20 or something seems so big for just 2..

 

[Azhael]

They grow fast, so i wouldn´t use anything smaller than a 40L. I keep my pair in a 40L, temporarily, but i will upgrade them to a 60L soon. Give them space because they are very active.