Here's my 55g BW GSP tank. Eventually it went to SW (as GSPs prefer that as adults) but the tank just wasn't big enoough for both of them & I turned it into a reef tank:
here is some I keep one side darker then the other cause they seem to like this better learned by accident cause I didn't have the full size light then put full size light and everyone hid in rocks so went to 3/4 lighting and everyone stayed out swimming around ??
Nice tank. Those fish are going to outgrow the 125 though. What are your plans for upgrading? Also, the F8 puffer does best in low-end BW & the others like high-end/marine, as adults.