6ft By 2ft By 2ft

well if you use the inch per gallon rule then you could get 90 as its near enough 180 gal, and 2 inch per cory,

but id go for a few less than that as with a 2 ft tall tank you don`t want every one on the ground and it may get a little crowded for them, but 40 or so along with some angels ect would look good
 

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