Not at all -- now, I have a bit of debate with folks on this one. many assert that you can't mix BTAs especially high end ones with others... (perhaps its the royals vs the commoners? lol) because if you do, chemical warfare ensues and you get a hot mess on your hands.
I am of the opinion that you can mix since they are the same species despite coloring... and chemical produced by one is very similiar to that of another. I don't refute that bad things can happen when mixing but it may very well be due to other factors like external bacteria etc. There were others who claim you can't mix wild and aquacultured as well... I'll change my tune when there is a controlled study that proves things one way or another.
In any case, I won't belabor the point... a BTA only tank is no harder to keep than any other. From my experience, you need good lighting, flow, and filtration -- many folks also run carbon just in case. If you subscribe to the no mixing rule... get all the same type of coloration. For me, I think an all BTA tank is mesmerizing... but then again, I have 10 tanks so I get to muck with options.