biggest? Poly

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Really big congicus, or maybe a p. bichir bichir, although I highly doubt you'll get one of those. The cong might work though, as long as it is very large.
 
Or you can get a huge endy. Those from 18 inches onwards. They should do ok with RTC and TSN.
 
I don't think you want to keep a slender fish like a bichir with a rtc or tsn. Dinner time will come around sooner than you want it too. Plus, RTCs can get up to 4' long, and there isn't a bichir that can compete with that.
 
congicus if you can find one in the 36"-40" range
 
if you got a huge bichir it could work for a while but for life i'd say no both of those can et 5 feet and get atleast 4 so it could work for a while but not for ever
 
:iagree: not to mention chances of seeing one of those large species of bichirs near their max recorded size is very small, let alone finding one and buying it. and in general growing one out will most likely not get you there.
 
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