My Oh-so-humble opinion, based soley on how mine is doing in QT
and considering yours will spend at least a month (maybe 2 if you have to treat) in QT
anyway... I say he'd be fine. Just keep up on your water.
I saw a LARGE PT at my LFS
yesterday. That thing was the size of a dinner plate! I was amazed! I will feel awful if mine get that HUGE. 120 is never going to be enough space for all of that fish. I'll definitely need the 400 by then!
Get the biggest tank you can when you upgrade...
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