Question about rat cage and ledges?

i have 2 rats also and when there were babies i had a cage almost the same as that one it workers great for babies but now they are adults and that cage is way to small for then! just because i love my rats that much i got them a ferret cage that is 4 feet tall! they love it! they will run up and back down chasing each other! so if you want some happy campers i would get them a bigger cage!