Depends what variant you get. If it’s the Bahia strain they attain the largest sizes as oppose to the wild variants such as Rio dolce,parana,tocantins etc. wilds anymore are rare and the only person I know personally that still brings them in is Derek
D
dereks
fish/
E
Elsurati
on Instagram. As for rules to tank size there’s no such thing, a glass box is a glass box, it all comes down to judgement and personal preference. I still stand by grabbing a big group and thinning down to what you consider appropriate based on your judgement over time.