I just switched over my fish from my 10 gallon to my 29/30 gallon. While in the 10 gallon the plants I had looked nice and I considered the tank fairly heavily planted ... the fish seemed to like it too. So, now that the plants are in the 29/30 gallon they look very thin and spread out. I know I will probably need more but my question right now is planting them in the gravel. How deep do you all (those who have live plants) put them in the gravel? Also, I was thinking of switching from gravel to sand ... or maybe half and half like I had in the 10 gallon. What do you guys recommend?