It really depends on the type of mudskipper, the widespread argentilineatus likes high 70s to mid 80s but only gets a slender 6" long and would most likely get eaten. The Atlantic and common mudskippers prefer cooler waters and most of the Indian and Malaysian ones are tiny. You could keep the giant mudskippers (P. schlossi) with banded archers, they like the low to mid 80s and the same salinity and get large enough not to be eaten (9-11") and are very hardy. They can be hard to find though.
