You're probably fine with the two you have. If there is lots to eat in your tank, the tiger tail will get pretty long. I started with 2 and now I have 4--a little asexual reproduction going on. At one point 2 of my cucs stretched the entire length of the the 4' tank.
How big around was the one you saw? The tiger tails can get really long but they pretty much stay the same thickness.


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