I've heard that silver dollars can get as large as dinner plates(?!) so I know they need a large tank but how large do you think 6 adult silver dollars would need? There would be other tankmates, but nothing too large except for the SDs.
And does anyone know how fast they grow? E.g. would a 90 gallon hold them for a couple years or no?
Minimum tank size for school of silver dollars
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a201 has given some good advice. I always recommend people to get the spotted silver dollar unless they really want a huge tank because some silver dollars do get about as large as dinner plates and most people's tanks aren't equipped to handle them.