Ok tell me if I'm having an irrational thought. I'm thinking of taking all of the wilted Monte Carlo out of the tank and replacing it with HC Cuba. I could take some roots, from the already established HC Cuba, and split them to cover more area. While I'm at it I could reform the hill and make it look nicer, do what Keith mentioned and reinforce the hill with slate. If that doesn't solve my problem I could replace the big rock with a smaller rock.