Geeze, I'm no pro bsk but can tell you that it is probably
enough, though I prefer my tanks to be way overfiltered.
I have a 55 gal
in which I'll run a Marineland H.O.T. (hang on tank) Magnum rated for 50 gals, and a fluval 304 (same filter but last years model) rated for 70 gals.
This is over double filtered, but I have a lot of driftwood and plants that reduce flow.
Depending on the amount of hardscape, and bioload you may or may not have enough filtration. As it is I'd say you're on the correct side of the cusp. Maybe adding a powerhead is the perfect solution.