I think the rock scape looks good
I would change the powerhead aiming though. Try to aim them so they blow across the rocks more, not just straight across. This will help in preventing alge build up on the rocks and glass. I would move them to the back corners and aim them blowing over the rocks and towards the glass. You might have to play with them a few times like moving them higher and lower and what not. The goal is to eliminate dead spots of flow.
Hope all that made sense, keep us updated
