As well I think it might be and idea to add air holes to the bottoms of the Second cups. Not on the bottom so water leaks out but above on the sides so air can get in. I have noticed new potting Pots at the stores have this. It makes sense so stale water doesn't sit in the bottom of the pot under the soil. Without the holes that would basically be the same as haveing no holes in the bottom of the pots becasue the cups together are air tight with the weight right?

Perhaps get some trays to use instead of a second cup.

just an idea again...

kd