I would think a 20 gallon high
would be fine for 4 medium discus for about 6 months
they want to get big
so long term you want to use your largest available tank
65 gallon is a really good discus tank
36 x 18 x 24 inches
L x W x H
56 column tank is good too
30 x 18 x 24 inches
L x W x H
any big tank, 37 gallon, 45 gallon high, 55 gallon
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