Don't forget, Hobby Lobby sell gel super glue as Extreme Power, thick. 1 oz at $4.99. That's what I use, same as coral glueYours is a pretty neat setup on how you rotate them. that is a great idea on mounting it to a magnet and just rotating that a few times throughout the day. I can employ that relatively easily. Just have to buy the magnets. I have it mounted upside down but I can easily take that rock that it is mounted on and glue a magnet to it.
This is how the scleronephthea have been faring. I first pic is the oldest and the last one is the most recent.