I got a 15cm GATF and right now im trying to train it to eat Pellets. It has been around 3 weeks since its Last live fish. Is it normal? Or should i consider to give it some fish already?
Be careful with that. I tried getting my 3-4in GATF on pellets by starving and it pretty much starved itself to death. Not sure when you got it, mine was new, but I would recommend you fatten it up a bit, get some size on it so when you begin this process it does not end in tears.
15 cm = 6 in
If the fish lives by itself, you can go for another week, before cave, and give it live fish. If there's other fish in the tank, GATF may go after the other fish. In my experience, try the Hikari floating stick may get better chance of switching ATF to "pellet"