I found these guys around 2-6 feet from the shore line in 1-3 feet of water depth. Mostly open sandy bottom with some cover. Lots of juvenile largemouth in this area but they seemed to be targeting the gambusia more then anything. I believe I only caught males. I was catching them with a small panfish hook and a piece of worm. The males are aggressive feeders. In the photo the dots all over the body I believe indicate it is a male.

The females appear to be more of a spotless brownish gold throughout.

Unlike most killifish or topminnows these guys stay near the bottom. I am going to target more females and see if I can establish a population in my pond.

They are apparently fast growers and can adapt to high salinities.