Don't suggest more light, that will just cause him more hair algae
Seriously, i have fought this fight before with big box chain pet stores like Petco, Petcetera, etc...I even sent a letter to the president of Petcetera complaining on how they treat their small animals....
you can't save the world, those stores exist mostly for large pets and their owners(dogs/cats/etc) not for small animals like fish. You can try to suggest but most likely, even if the manager seems nice and is willing to make a change, that change will not come or come so slowly those anenomes will be long gone.
my 2 cents.
and YES, JL all the way!