I just got an old 55 gallon tank out of storage and set it up again. This time with live plants in mind. I was just curious how deep ya'll make your substate; 1,2,3,4,5, or more inches deep????? I start my own seedlings for my garden and have learned the bigger the pot, the better the seedling grows. I didn't give this any thought until after I filled my tank with 55 gallons of water.