Wow, thats a lot of MBU's... how many have you got in there???
But okay, lets start with the basics...
Please DO NOT Feed them Gold Fish or Any feeder fish for that matter, its not good for them and they aren't piscivores...
You should feed them things like: Shrimp / Mussels / Clams / Scallops / Worms / Pellets / Crays / Etc,
2nd, what sort of filtration you got on there, and what are you planning on doing with all those puffers?
Coz in all honesty, they aren't all going to last in the tub for very long considering how big and fast they can grow...