Never tried an oyster only clams. Interresting question though.
I have some oysters. One I have no idea what it is called. The other is called a "stony oyster". This may or may not be the accurate name.
They have been doing fine. I am target feeding DT's phyto. I don't know the long term, I've had them both for about 5 months. Hope this helps...
I have some oysters that were hitchhikers on my LR. They seem to be doing fine after 8 weeks, opening up and closing at the slightest touch. Only time will tell.