I'm not sure... problably a Gold-spotted mud skipper. And yes you need a pool for it. Like in their names Mud skipper, so you probably want to use mud... Actuly if I were you I would just go out were you caught it and collect some mud and drift wood, and you should test the water in that area and then try to mimic that out of water from HOME, And like stated brfore they prefer brackish water, so add some salt to it.
And yes they are a fish, so they would be better if they had more water than land.