What happened to all the fish in your 180 you said had on your profile? Any way it's your choice in the end. TSN have more narrow mouths then your a rtc would. Plus if the TSN gets to big and starts to really catch your arrow but the TSN in the well first no problem. Fish are more or less guessing games. If it can fit in its mouth there is a chance it will eat it. My tigrinus lived with 2 Paroon sharks since they where 1" they where 4" a month and a half later and he finally decided to eat them out of the blue. Also I kept a rtcxtsn with some turtles. They turtles first tried to eat him and within 5 months I walked downstairs to him choking in a turtle.... They both survived but same concept.
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the thread is almost two years old, the arowana has already outgrown the 180g tank, no matter what size it was when the thread was started.