The slope's fine. It's the choice of rocks that's a problem. Most of them are going to be lost once the plants grow in, especially for most of the rocks on the right. Even if you were to go for small plants like Hemianthus Callitrichoides as a foreground, it does grow out(when it forms a proper carpet) to a certain thickness and unfortuneately, this will cause most of the rocks you have chosen to be swallowed up.
Call me Brian.
P.S. This is what part of the alphabet would look like if Q and R were eliminated.
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