I purchased Eshopp AEO 15005 reef sump a few months ago and it still works well. The refugium compartment was bigger than I thought it would be. However, it's more likely to get damaged easily.
In my opinion, with your 10-gallon tank, you can stock 2 clowns or a couple of clown goby. I have a lovely smaller tank and I only stock a couple of clownfish and they look great.
I think you should out your fish to another place and then replace the water and remove all broken rock. My husband used to do it with my 55 gallon fish tank of mollies fish and it worked well.