Yes the camera looking things are powerheads, they are good as they have a very wide nozzle which means that although they are much more powerfull that the standard powerheads, the actually output is a gentle surge which is more coral friendly and provides better water movement which is really important in a marine tank
The tank is 100cm long by 40cm wide and 45cm tall, the lights are Arcadia 4xT5 luminaires
I had it running 1 month before adding the clowns