Dwarf Gourami. Stocking a 29g. Help?

Possibly, but khulis are mostly bottom feeders. The angel will eat them voraciously enough that I doubt there will be much left for anything else... lol
 
and if i got around 5 medium cories instead of the kuhlis, i should still get around 6-7 cardinals?
 
Theoretically, yes.
 
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