TINZE Stream, this thing really works well, I'd say it is made like a pump and has a prop instead of an impeller! 1850gph, with an electronic controller that pulses the motor with seperate presets for low and high settings. It also has a feeder delay and auto night settings. It will blow a rock over if position wrong, It works better close to the top of the water due to its wide pattern.
The #3 picture is close but none of these justify the real thing.
Yes rocks are full of alage growth, only the rocks on the left are slighty bare because they are a few days old but will catch up quickly.