take out the black light diffuser panel from underneath and see if that gets your foam head in the body of the skimmer higher (without adjusting). That looks like just one piece of panel but it still should get you skimmer lower in the water a half inch or so. Unless that stand is deeper than it looks ;-).
the recommended depth is 7.8 but i would run that skimmer at 9 inches.
the recommended depth is 7.8 but i would run that skimmer at 9 inches.