Check out my homemade underwater mines (Moored Mine). I cast them out of a special epoxy from 6 different models that I made. They are anchored with a simple plastic disc and plastic chain. It is awesome how they sway with the current and watch my little guys swim through the outstretched chain. It adds a cool dynamic element to the tank. I am usually not fond of fake stuff in my tank but after I saw these guys and how well they worked in my tank I had to make an exception. I am selling them if interested on etsy.com at the link below if interested.
http://www.etsy.com/listing/98382697/fish-tank-decoration-floating-aquarium
http://www.etsy.com/listing/98382697/fish-tank-decoration-floating-aquarium
