Once when replacing some old rockscape for diver collected rock, I noted numerous cryptic sponges on
”dark side” of the rock.
75G display on top and 30G cryptic refugium with mud filter on bottom.
Last picture is 30G fishless sponge tank.
”dark side” of the rock.
75G display on top and 30G cryptic refugium with mud filter on bottom.
Last picture is 30G fishless sponge tank.

