40g Discus Tank

Do they need to be a pair ??Would a 40 long be okay just the same? 40br 36x18x16 vs 40Long 48x12x16.
 
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I would suggest if you do keep them in the 40..you should up the water changes to atleast 2 weekly fairly large water changes.

I do 40% in my 75 with 7 discus in it.
 
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