I moved some furniture last night and for the first time in a year or so, exposed the side of the tank, including the weir and discovered this magnificent creature - but what the heck is it (about the size of a medium pizza)
I understand all the little white tiny 'things' are siliceous sponges, is that just a giant one forming?
I understand all the little white tiny 'things' are siliceous sponges, is that just a giant one forming?