Maybe someone knows about this!!!

I live in NE pennsylvania and have access to a fantastic private lake. It's about 60 acres. Lots of cover, structure, etc. Water is shallow...deepest part is about 10 ft. Tons of really nice bass. The problem? They just won't bite. I mean, AT ALL! I've tried early morning as well as evening and even mid day (it's been in the 90's here!) The water has a very very green algae bloom. There is no scum on the surface, just green water. We tried flipping jig, senkos, plastic worms. We fished the floating vegetation in the middle of the lake. NOTHING! Anyone have any ideas. I'm an experienced bass fisherman, but i just wanted to get some opinions 'cause I can't seem to figure this out!