We've been told that the adult fish of that GT is about 4-5 inch.
And i've seen it before also in a LFS, where the adult male & female are about that size. The tauke got the pair from Taiwan but not willing to sell it, keeping as collection.

Most probably, he's planning to breed them for local market.

But that was last year, i went to the same LFS but no more GT of that kind. Could not talk to the tauke to get more info.
May visit them again iof i got time, perhap next week end.

Cheers