If you do get hatchets you need to have a solid lid as they are jumpers. You may also find that you are not as happy with the mix of colors and looks that all these different species present. What else is going into the tank? Driftwood, plants, substate type, etc? This is always important as it can help deflect some of the aggression in some species and provides areas to hide. If you are going to do the butterfly than I recommend having some tall stem plants for it to dart into near the surface to cut down on nipping.
I would not get Tigers or Green Tigers in a group of 6. You need at least a shoal of 10 of them to focus their nipping on each other instead of other fish.
You may also find that your lower water is overloaded with fish as the loaches, goo obo gudgeon, farlowella cat, bristlenose will all tend to stay closer to the bottom of the tank. You probably should find a rainbowfish that you like that will stay smaller or a tetra to provide a second shoal in your midwater area of the tank. The Serpae tetras are a pretty hardy fish to provide that balance.
I would have to be the third person to tell you not to get the Badis as I dont predict good things if its placed in this tank.
I would recommend a tall piece of driftwood just off center. This will provide the pleco its preferred meal. Also recommend if you are going to be keeping such a heavy fish load that you balace that with some plants. This will help with sucking up some of the chemicals released by the fish as well as provide hiding places if the barbs become nippy.
Two cents
Rob
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