I would have to say T. cyanea, more suited for pot culture than epi-style. Moist potting medium is what's needed for this species, although if you had an extra specimen, why not try it with an eye on keeping the rootmass damp. Another look-alike is T. lindenii, named after Linden who described a varigated form of cyanea.

Thankyou, good to know, I'll try one of my three in a smi-epi area in the terrarium I'm putting together and the other two will be strategically placed in the soil. Thankyou!