It's all just a matter of degree. If you scrub strong, but feed strong, you'll be able to keep the same softies as if you fed light but scrubbed light. The difference is, by feeding strong all your other corals (and small fish) get much more food (10 time more). You also have the option of liquid coral food, preferably continuously. That'll put lots of nitrate and phosphate into the water for the softies.