I love grammas but yeah have never been able to keep one very long. I had a fire fish with my orchid dottyback with no issues. I’m not sure how it would do with a gramma, they have the same body type. If we are talking about your cube I’d say no, not enough territory, in your dad’s 125 it might work. Dottie’s swim around more than grammas which is nice. They don’t seem to have a specific cave they live in. Mine is all over the tank in and out of the rocks.
