As far as i'm aware, its a Marine tank Iver has set up, was going to be for their huge breeding motoro stingray but after something like 14 litters, something happened (i dont know what) and they lost her... so they are setting it up marine, i think they were cycling it freshwater and then adding salt and cycling it further. Think Blue Spot Rays were on the wishlist... but hey... that was 3 weeks ago, who knows if they have changed their mind LOL