what types of butterfly fish can fit in my tank

Copperbands almost always starve in captive tanks. They are very hard to get feeding, and do not do well with other active fish in the tank. Even if one was going to attempt one, they need a large, 6 foot tank.

Leave them in the ocean

The smallest butterfly I know of is the Kleini's Butterfly, but even that one requires at least a 55 gallon tank
 
Check out liveaquaria.com -- they have a search filter based on tank size. So go in their butterflyfish section and filter to the smallest tank size requirement. That should get you started. You'll see that your 40 is definitely too small for any of them.
 
I am not going to ditch the seahorse idea but I am just getting a diffrent tank with butterfly fish the seahorses will be in a different tank
 
Almost every butterfly I am aware of besides the Kleinni requires at least a 125 gallon tank. Many of them are very difficult to get feeding, and they will munch on any coral or other sessile invert
 
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