sensitive really depends what you consider sensitive. LPS are a little better than SPS for sensitvity but yes soft corals generally will grow better in tanks with higher nitrate levels because they are most herbavores as oppose to SPS/LPS whose man source of food is either meaty like shrimp or zooplankton. Keep Nitrate below 8/10, you shouldn't have an issue. My LPS grow and my nitrate range from 0-16 but at a slow rate, not a 16ppm change overnight.