After first skepticism and some research, I managed me to about a month ago the Twin Star Nano, mainly to get the green algae in a retracted 125-liter aquarium in the handle, as this reinforces the discs but also the plants produced by unavoidable daylight sun , Initial observations indicate that the growth of algae effectively and in particular significantly reduced precipitates on the panes. The weekly cleaning disc I could switch to fortnightly and this with a much lesser extent. The algae growth is clearly gone back on the slightly slower growing plants, but especially on the windows and furnishings. I noticed also that can be the calcium deposits in the water level considerably easier to remove, a fungal disease of my mosaic gouramis has disappeared and let the since the installation of the TwinStar nano (TSN) look no more planar. Whether this is related to the TSn, I can not say. Here takes the pH-controlled CO² consumption since the TSN use conspicuously, there probably increases the oxygen supply of the PH value and is reduced by the CO² again. Whether that's good in the long run, I'll be watching. So far I can say mostly positive observations and would the TwinStar buy nano again. What really can not be assessed positively, is that I also previously known fact that everything is kept in white and probably (I hope in the short term) to be an aquarium trend. This can be done by me but a point deduction, there is no alternative color is available. But by me a buy recommendation, provided green algae problems exist.