I would be hesitant to put an Achilles in anything less than a 7'-8' long tank. They seem to be incredibly sensitive and really need room to stretch out. Tangs grow more aggressive as they get bigger and 3 tangs in a 125 would be too much long term, IME.
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Matt
Patience is the best remedy for every trouble.
Titus Maccius Plautus (254 BC - 184 BC), Rudens
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