I had one. Pretty sure Colt used to do maintenance on them if he didn't have them himself.
That's a beautiful reef tank! I didn't have corals because I kept the fish that would destroy them. 🤣
At one point in time, APBT and AmStaffs were the same. When AKC closed their stud book to APBTs is when they started changing. Each breed then went in different directions.
I run a 3.2 gallon for a Betta. That is what I'm currently using. Just make sure your friend monitors the temp closely. They work, but not super great. It's sort of hit or miss IME.