How big is the tank? A 20 gal?
I had two of my Larger Tigers in a 27 long (36x12x15") and that was just enought, but they kept growing and then I had a few more get brought to me just after I moved them to a 48x24x15" terrarium.
I Have the 5 together now, and the terrariums is just big enough for the 5. If I get any more Tigers, I'll put them in a large Rubber maid bin or something until I get another terrarium of the same size made. Mind you all my Tigers are over 10" now, so they need the room, any smaller and it would be very cramped for them.