Ok, ok! Im not Carol but may I put my 2 cents in?
Im not sure that discus really mind surface agitiation and in actual fact, my tanks do have quite a bit of surface movement with no ill effects (Id rather have lots of agitiation to increase gas exchange between C02 and 02). Matter a fact, sometimes my discus like swimming right in front of the filters or pipe where the current is the strongest (perhaps for excersise or something).discus don't like surface turbulence
Where surface turbulence does become an issue is in planted tank when injecting C02.