HCA: Hermit Crab Association

So, I don't want to brag, but today I got a 29 gallon tank off Craigslist for $15!!!!!!!! I was so excited- I had just priced it at Petsmart for $85(and that was the sale price). I filled it with water for a stress test and it passed. My question- how many small- small/ medium hermies are comfy in a 29 gallon? Thank you!! Got the tank set up- although the PP's and Eccies seem very confrontational (the Eccies are new, fresh out of a month ISO). Will they eventually live harmoniously? They seem to be kind of wrestling and does anyone have any suggestions for my tank? I'll always welcome new ideas to make my guys happy

@Kryorke, you could do five or six smalls or three mediums in a 29gallon aquarium and still have plenty of room left over for climing decor, water/food dishes, hides and extra shells.