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No I don't think a tetra tank would be boring but I'm kind of biased LOL.
You have so many choices and best of all most of them are peaceful.
Rummy boses and Cardinals look great together. You could substitute Neons for the Cardinals.
Another way to go, even if their not tetras (I beleive it was already suggested) would be Harlequin rasboras.
Perfection is not attainable, but if we chase perfection we can catch excellence.
Once you learn to quit, it becomes a habit. -Vince Lombardi
“Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are.” ― John Wooden
Sandy Hook Elementary......Lest We Forget
See my profile for my tanks and what fish I keep