40" not 40 cm. And it will reach most of that long before 3 years, much less 5-6 years are up. Although some people will tell you they don't, there are a dozen or more threads where people vouch for seeing 3+ foot long fire eels in aquariums.i thought the Fire Eel only got to 40 cm
Even if it only gets to 32" (20% smaller than we know it can reach in aquariums), the fire eel --- by itself --- will produce 10 ppm of nitrates per day due to it's feeding requirements and thus force a 100% water change every 1-2 days. And this really ignores how horrible that situation would be for a 30" fish.
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