Most often, people recommend a minimum of 3-4 for both GH and KH, and are happy with anything above that. The only times there are problems past that is when you start getting really high GH (well past your levels) and certain plant and fish varieties. At moderately high levels (still past your ranges) you'll have a very small number of varieties that may struggle.
You probably won't ever have to worry about either of those again. That's a gross generalization, but you're in a pretty nice mid-range where just about anything can live and grow happily. Unless you decide to start going very exotic, it's not a concern. You might have trouble keeping Lake Tanganyika livestock, for example (too soft). Or really sensitive cardinia shrimp (too hard). There are a number of soft-water plants that *may* struggle with your parameters, but anything that would definitely struggle will probably be rarer and more expensive (if they didn't struggle, they wouldn't be rare or expensive, as your parameters are pretty run-of-the-mill).
Anyway, no reason for concern.