How many co2 reactors/diffusers: Is more better?

Hello,

Planted tank in the making:
90 gallon (48" L x 18" w x 24" h)
co2 injection w/pH controller
--co2 via co2 Reactor 200 w/pump
220W compact flourescent

Question:
for tanks that have a large water column, or for long tanks, is there benefit of splitting the co2 output to 2 as opposed to 1 reactor/diffusor? Do any of you do this?

I do not plan on feeding co2 output to cannister input, which would be one alterantive.

Thanks,

growitnow

Mgamer20o0,

Thanks. What size tank?

growitnow