In Reiki you can use it to help heal yourself through self treatment and others after the first attunement. In Qi Gong you need to be a master before treating others. Reiki is said to use universal energy and Qi Gong uses your own energy. You could explore both at the same time. If you learned Reiki first you could begin healing yourself and then as you progress in your Qi Gong practice you could learn to better control your own energy flow.
Qi Gong you don't have to do alone but it can be done alone.
Rieki, of course requires at least two
Why not do both?
In Reiki you can use it to help heal yourself through self treatment and others after the first attunement. In Qi Gong you need to be a master before treating others. Reiki is said to use universal energy and Qi Gong uses your own energy. You could explore both at the same time. If you learned Reiki first you could begin healing yourself and then as you progress in your Qi Gong practice you could learn to better control your own energy flow.