If all you put in the addition is bass...I would first suspect the "minnows" are from a spawn. The tadpoles are likely toads and yor bass will eat them, but with that much sediment suspended in your water, and being a sight feeder, the bass would be hurting for food even with tons of forage.
Plant whatever will grow in your area as soon as you can.
I'm betting since the dozer was a rental, the topsoil wasn't saved to be re-pread over the top of the clay. If not, it may be a very long time before anything will grow on it.
