Avoid using citrus fruits and pineapple as they tend to split the yoghurt and turning it bitter. However, topping it with a few bits of citrus just before serving and consuming within 30 minutes will not alter the taste.(that’s what I have done)
The use of nuts is totally up to you it tastes perfect without it too.
As a short cut, I sometimes do a cheats way of using Greek Yogurt. This does bring in the taste factors perfect but is a tad bit thinner in consistency.