can i take both....
Amphibious: Some undines are born with a permanent bond to water. Undines with this racial trait gain the aquatic subtype and amphibious special quality. This racial trait replaces the spell-like ability racial trait.
and
Mostly Human: A few undines have appearances much closer to those of their human ancestors; in fact, they may not even realize their true race. Such geniekin appear to be human, save perhaps minor features like unusual eye color, and they count as humanoid (human) as well as outsider (native) for all purposes (such as humanoid-affecting spells such as charm person or enlarge person). These geniekin do not automatically gain their associated elemental language (but may select it as a bonus language if their Intelligence is high enough). This ability alters the geniekin's type, subtype, and languages. Source PCS:ISR
or do they not work together?
