yeah I am a botia lover!
I have 2 clown loaches that I have had for two years and are ~5" very slow growers!
I used to have a botia modesta, a badass fish! he wasted a couple of fish in my tank including my beautiful siamese fighter. So you are in wellington, where about? I agree with you in saying you shouldnt give them to a pet store here. Infact I have got most of my fish from hollywood fish farm, i have got an archer(very cool fish) a giant gourami a orange chromide and a siamese tiger. I have had my siamese tiger from them for about 1 month now and he along with my fire eel is my favourite fish. Although i payed a pretty penny for him!
So your also a puffer lover ay? I am sure you could get a giant or nile puffer but as I said on another post at 2'+ they would be able to take a finger off!