Need help with stock list.

[tailgate1979]

I have a 55 gal with crushed coral, 2 emporier 400 filter's, and some base rock(don't want to do live rock).Were wanting to do a aggressive tank, we could realy use some input on the stock list so far here is what we would like to add.
1 porcupine puffer
1 clown trigger
1 (maybe heniochus butterfly)
2 urchins
I would like to know what yall would recommend would a butter fly fish go with what I had in mind?

 

[btldreef]

I definitely do NOT recommend putting a Porcupine Puffer in that small of a tank, especially with a Heniochus Butterfly. It will definitely nip at the Heniochus' dorsal fin, and probably will bite it as well. The clown trigger might do the same as well, but again, it doesn't belong in a 55G tank. Both the Puffer and the Trigger really need 100+ gallons. Aggressive fish in small tanks become even more aggressive, and usually it becomes uncontrollable.
Unfortunately, a 55G is really too small for most aggressive fish. In aggressive fish land, a 55 is like having a nano.
How about a Toby Puffer of some sort, such as a Blue Spot or a Leopard? A small puffer and a dwarf lion might work. You could probably get away with a dwarf, the butterfly and a small puffer. I'd add the puffer last, so make it less likely to nip at the lion or butterfly. Other options would be a Flame Hawkfish.
You could do an Angler, but it's hard to put other things with them.