Dangerous fish combination?!?!

[chaos]

I have a volitan lionfish, snow flake eel and a dog face puffer. They are all from 1.5-3.00 inches. My girlfriend has a 30 gallon with a auriga butterfly fish about 2 inches, tear drop butterfly about 2 inches and a red scooter blenny about 3 inches. Now he tank in leaking water thanks to her 5 year old. My tank is a 55 gallon with about 30 pounds of live rock. Since her fish are around same size as mine would it be safe to just put them together instead of spending 100+ dollars on a new tank?

[chaos]

There is also a 3inch coral beauty in there as well with my fish.

[leebca]

Your display tank is too small for the inhabitants you now have. There is no room for them to grow. The new fish will usually lead to a lot of aggression.

Your girlfriend's tank was also overstocked. I'd recommend new tank or give fish away or to an LFS for credit.