i used to have a 125gal heavily planted tank (aniubias, onion plants, jungle vals, crypts, corkscrew vals) with a 12" clown knife, 12" gar, and 12" dorado -- the gar especially loved the onion plants which were about 4-5' long so there was a mat of foliage on the surface for him to hide out in -- the dorado would uproot plants every once and a while when he went after food but none of them really disturbed the plants that much -- used to have pics of it but i dont know where they are
i used a combo of power compacts and standard flourescents in the 6500K range and added fertilizer sparingly
i had to break the tank down and move the fish to a bigger tank and i seperated most of the plants into different tanks, but a planted predator tank can definately be done -- just be sure to use hardy and thick leaved plants -- i dont think many of the highly ornamental, delicate varieties will survive the general wear and tear of big fish