Drill 1/8" or 3/16" holes in the bottom, and about 1/4 the way down from the top of the cage. That lets out the air at the bottom, but keeps some in at the top. If not, it might try to turn turtle on you when in the water. I agree about the noodles and the hole in the top...
Scott, I'm new to the whole cage deal, but noodles on a bar 10" below the top of my big cage is what I used. It keeps a turtle/duck barrier up above water level.
Noodles are a great tool to keep around ponds. I use them to float my weed rakes, keep FHM pallets floating at water level, and on my cages. A good investment for a couple of bucks.
Oh RC, nice cage.
