Most bromeliads are epiphytes and what appear to be their roots are merely attachments so they can adhere to tree branches, etc. If these are kept wet in soil, the bromeliad will rot. Nourishment comes from organic debris dissolved in water that accummulates in the vases or cups in some species. (Not all bromes are the same, so this is a generalization about the kind we keep in terrariums.) They need to grow on something like a branch with sphagnum, or some pressed cocoanut fiber panels that their stolons can dig into, but never get saturated with moisture. Most Tillandsias need even sharper drainage. Spanish Moss is a Tillandsia, for instance. It hangs from Oak trees, but is not a parasite. It lives on it's own, just hanging there in heat and high humidity. This doesn't even have the water and organic debris collection vases of some of the others, and actually appears to live off purely humid air.
I would guess you are growing your bromeliads like a petunia-- giving them soil and water on the "roots." or even fertilizing them. Just peg them into a piece of cork bark, pressed cocoanut fiber, branch, or whatever you want it to attach to, up in the air, then just spray it once a day or so when you mist your frogs. Give it good light. It it gets soggy or wet for any period of time, it is going to rot.
-----
Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus