Thanks, at first I had the "itch" and to be honest I'm still fighting it. ADHD definately does not help lol and I know exactly what you mean about the spaces bwtween the rocks and it never occured to me until a few hours after looking at them. But I can't think of a way to fill in the gaps without mixing more mud and filling them in...but unless you know a safe mix that won't add lime and other cement hydration byproducts to the tank I can't think of a way to do it.

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