Drive in, light green, not recognized

I added two new WD 3TB drives to my FS. One turned out to be bad I guess as the light went red so I removed it. The other is showing green but it’s capacity is not reflected in the capacity totals so I’m assuming it’s not being recognized for some reason. I’ve restarted & shut down the FS and still it’s not being recognized as added capacity. Please help!

Could you please post which was your previous disk setup? How many, and how big were the drives before you added these two drives?