Join Date: Nov 2007
Location: NYC & Long Island, NY
This is not going to help you right now, but I grew my foreground in emersed, and the root system on my HC and HM is insane. My HM in particular has more roots than leaves and stems. So again, while it wont help now, it's something to consider for the future.
You might want to top off your foreground with a little more substrate, bury it a little deeper, around the filter output. Or, adjust the filter flow for a week or two until the substrate can root.