Phil , thanks man. Cleaning it? Just get all the layers out and wash them. Why?
Why? - Because that could be a lot of work, and you will never be able to clean it like new again. You only have 10 fish in 1000 gallons, so it shouldn't be too bad.
Let's see how this goes.
Probably want to get some sort of pump and use it like a vacuum to suck all the stuff off the bottom when it starts to accumulate.
