i find my mudskipper (australian, from the tropical north) prefers a 2-1 ratio of land to water, and try and make some little caves both under and above water for shelter. The tank needs to have a lot of uninterrupted space in order for the little guys to skip about freely without damaging their fragile skin - file away any sharp edges from rocks/driftwood. they thrive on variety so mix it up, i used coloured gravel sloping upwards to make the pond, and used knotted driftwood, and large smooth rocks to make up the rest of the land areas.
also they love to hunt and kill so i would provide them with some small crickets in addition to frozen bloodworms. remember they will eat whatever you throw at them so one cricket a day should suffice.
anyone else with mudskipper info pls message me!!