Hi - yes, its BTN slimline - i really like them, beacause they dont take up any space in the tank - i really dont like the large bulky backgrounds - they take up too much space, and since the rays really need the buttom surface, thats prettymuch a no-go for me.
And i think the aro right now is working hes way towards 35 cm (About 12-14 inches) - hes one year old, and starting to slow down on the growthrate. So far hes doing great in my 7 foot tank.
