Do you think it's easy to set up CPU mining on a GPU mining rig ? Or do you think the CPU mining running at the same time will decrease the overall efficiency of the GPU mining ?
i suggest you mine Electroneum with ur CPU. Thats what im doing

Not getting much but my computer is always on anyway so might aswell

10 ETN / day. I think value will increase in the future.
Would you have a software to suggest to mine ETN ?

Okay, well a CPU has threads too, so an average i7 has 8 threads, you can set it up so it uses 7 threads, keep 1 thread available for any other stuff going on, including with mining