Cattleya's in Semi Hydro. Should I repot?

[leslieann79]

The majority of the new roots seem to be growing out of the pots. Is this cup too small? Should I put it in something bigger? Also in the last picture at the bottom of the plant there is an accumulation of white stuff. Could that be salt from over fertilizing? I have a water softener that goes through a whole house filtration and then through an r/o system. TIA