yep asian bumble bee catfish Pseudomystus siamensis of the bagridae family.
i have one, very nice fish, yours is a bit lighter in colour than mine but i've seen a lot and they vary a lot in colour and even patterning. can get to around 15 cm / 6 inch so yours wont be fully grown, mine is just short of 6 inch now so probably fully grown fully grown and slim so its a male, i'd say yours is a male as is slim the females get really fat, like a ball! they are said to be very territorial to others of the same species and fin nippers but mine seems ok and i keep 7 large(ish) catfish in the same tank.
very nice fish!
David