If you got some IALs or perhaps put a thing of DW in there you could get the cories. But pandas will adjust to any Ph as long as it's not extreme! So, you're fine.
I would suggest harlequins, embers, espeis, endlers or some other tetra/rasbora just don't get a fin nipping one like the skirt tetras. Kuhli loaches would also be great for a bottom swimmer
For plants I'd do java ferns, baccopa monnieri, rotala rotifundolia, anubais, crypts, pygmy chainsword, or dwarf sag. Those all grow GREAT in my tanks, and aren't hard to grow at all!