Shallow Dirt Layer?
Most of what I've read about using dirt says you should make a .5-1" layer of dirt, then cap it with 1.5-3" of sand or gravel. My 5.5g is only 10" tall, so I want the substrate to be as short as possible. What would happen if I made a less than .5" dirt layer and capped it with only 1" of pool filter sand?
I can easily add more sand later if need be, but it would be very difficult to add more dirt. What happens if there is not enough dirt? (I'm using earthworm castings as dirt, if that matters.)