I don't think any one can answer this 100% guaranteed without knowing you frog. Some get stressed out more easily than others. There's is a chance that it could cause extreme stress, but if you were to change it and just give him time to adjust he should be fine. Just if he starts to freak out and starts flipping himself onto his back or other erratic behaviors you should probably put it back. He will probably love being able to dig burrows in the coco fiber after being used to sitting on the surface