Hm. I thought I had replied to this but it's not showing. Hopefully I didn't post it to an entirely unrelated thread. lol
I had 3. 2 small ones and one very big one. They go where they want to go and one of the small ones floated somewhere where I can't see it right on the first day so I've only been watching the big one and the remaining little one.
Both seemed to be doing really well (as far as I can tell). Then one day the big one just peeled off. Seemed fine the day before.
I had both of these for about 4 months and have really been paying attention to providing sufficient food for them.
Sorry to not have better info. I am guessing you are waiting for somebody with a 1 year old scallop to chime in. Maybe we can all check back next year
