[fishstein]

Allowing 3 inches substrate depth, how tall a planted tank do you think is sufficient for discus?

We were thinking of getting a 125L gallon 72 x 18 x 20 or a 135H gallon 72 x 18 x 24. Should we stick with the 135 g for the increased height? Adult discus are at least 6 in. high and long.

 

[JanS]

I have a 125 (although no Discus) and I think that would be high enough for them given the large tank size to start with.

I would have a hard time scaping in the 135, but I'm not exactly a big person either.

 

[Raul-7]

If you can afford the 135H, then go for it as the Discus will appreciate the extra room.