@Saltyanimals Curious how yours ended up? I'm currently seeing very similar behavior from my Royal Grammas and kind of guessed they may be breeding. Honestly I thought one had died because I hadn't seen it in over a month. Then I saw it out and kind of laying on the sand bed in the corner with the second Royal Gramma nearby looking like was checking on it, swimming down every few minutes. After seeing it laying on the sand bed like this I kind of assumed it was probably going to die and when I came home from work later and didn't see it, I thought for sure it just didn't make it. A couple months later I saw both for a second and saw that the other one was poking it's head out of a little cave in the rockwork. One has been out regularly in the evening around feeding time now but the other one stays in the cave. Feels like this started 3 or 4 months ago.
