I have not cleaned it since it went in.
Never had to.
The Cories, Algae's and Pl*co and 9 Kuhlis keep it spotless. must update sig.
Never get anything building it on it.
But when I took the Pix I did Notice how much Gravel the fish have moved into it.
May take some out, as that would be hard to clean the gravel in there.
OHH I got given some strange looking Loaches last week, but they have not kept still enough to photo. They have a Kuhlis Head and Pakistani Loach Markings. And they Are a dirty green color.