South Americain Tank Question

HI guys!

Want to have opinions on the matter. Right now, I have an Oscar, a JD, 4 Siver Dollars and 3 Severums, all juvies (1,5 - 2") in a 90 gallons tank. Cycled and plenty of filtration. I'm plannig on building them a new acrylic aquarium when tje fish will reach about 5". Maybe add 1 or 2 SD more.

The question : what tank size will be prefered for the when reach their full size? I was thinking 180g. What you guys think?!

Thanks!

Sry for my bad english, I'm french.
 
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