Make sure you lids on tight ( as you'll already know as you've had arows before) my 22" jar was really heavy set and strong used to smash the lid off my tank even with weights on it , found him on floor few times few very close calls
I've found as a varied diet try avoid live until pellets are going down regularly then only as a treat jars are really stubborn when I comes to food ,I've never used live feeders out of choice
only really worms mealworms and earthworms work well you can feed silkworms but again as a treat there full of fat and addictive as crack to jars suppose fishy equivalent to a bigmac
, hikari carni sticks they love , raw prawn/shrimp brings out the colours well . I also feed mine muscles and whitebait once they get bigger both to cut food bills down and to mix it up a bit keep him interested
Hope this has helped not really much more I can say as your not an aro noob and you clearly know about the aggression problems already hence the tank to himself
tankmates can be possible I've found big spikey cats work well irwini , Niger etc
Look forward to seeing updates on your jar keep us posted , good luck
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