I thought the first 2 pics were the same fish. I didn't realize they were 2 different fish. Are you sure they were both around 1ft long?
Fahakas are really cool. If you get sand, they will bury like a congo puffer. What size tank will you provide for your fellow?
At one point, I got puffer fever and tried to get as many puffers as possible. I'm glad a mentor stopped me before I got out of control.