Not only that, but they need 100+ degree basking spots, and special uvb.
As said above, the only "Rack" system you could use would be like this( theres more out there, but i think these look the best and work)
http://reptiledepot.com/showcase.html
But they are really just cages that can stack. But with these they have light fixtures which is helpful, and id suggest a mvb bulb so you would not have to mess with tubes in it.
and, they need four square feet of floor space, way bigger than a 55 gallon
This scares me a little(the red part mainly)!!! its good that you are asking questions, but any care sheet will tell you. Research, beardies are fun, but take ALOT of work! Right now you have them in what = to a 26 gallon, they already need alot bigger, but still not be housed together.