If it sounds too good to be true, it is haha. It would cost way more than 70$ just to ship a tank like that to the next state. But a 225g, delivered from the other side of the world, for 70$? No way, plus if you google "kroink scam", the first thing that comes up is someone saying they got scammed. Gotta use your head!
On your BGK question, I think some good suggestions have been made. Another that I'd consider when you do get a much larger tank, would be some geophagus. They aren't predators or eels, but they will grow to a nice size and have interesting looking mouths, very pretty fish. Would be a nice counter-point to the oddball fish in the tank with them, and shouldn't pose a problem living with BGK.
On your BGK question, I think some good suggestions have been made. Another that I'd consider when you do get a much larger tank, would be some geophagus. They aren't predators or eels, but they will grow to a nice size and have interesting looking mouths, very pretty fish. Would be a nice counter-point to the oddball fish in the tank with them, and shouldn't pose a problem living with BGK.