DataGuru

There are some awsome native darters pics here. species Etheostoma:
http://www.nativefish.org/Gallery/

danp

1. Some kind of Planorbidae-Ramshorn snail
2-3. Cottus asper-Prickly Sculpin
4. Myriophyllum spicatum-Eurasian watermilfoil (count leaflets)
5. Potamogeton crispus-Curly leaf Pondweed

danp

Also, the Cottus will live best in temperatures below seventy-five degrees. If you plan on keeping the Sculpin long term, which I recommend, make certain it's eating. Sometimes they can be fussy (Unless you have plenty of small fish/invertebrates in your aquarium). I'd suggest feeding cutup fresh or thawed shrimp if you run out of other options.