Hahaha either you got ripped off on JAR or you got a super bargain for green bro ^^ if it is the later, please hook me up. I bought green in Udonthani, it is almost double the price of JAR (jar fingerling is 1000THB)
for OP, in any case, what ever it is, it is not an RTG. wont comment on banjar other possibilities but definitely not RTG
The fish in the pix is mature enough (comparing to oscar and cat size) not to be ambiguous .... unless camera makes that much difference ....