In terms of observing the health of my fish, I tend to take a lot of macrophotos and one of the things I can’t stand is seeing drip marks on the glass (once you start looking at your photos through your computer) or interior build-up on the glass.
I typically use a long window cleaning brush but that could get messy when taking the brush out, as it collects so much water.
My wife recently got the Rosuwa Mini Magnetic Fish Tank Aquarium Glass Cleaner and she really likes it. Of course, I was set on the traditional way of cleaning my aquarium glass but then I ended getting one and I was pleasantly surprised.
I was able to clean the build-up with ease. Granted, you have to go slowly as certain fish are too curious about it and think it may be another fish or food and they want to follow it while you use it, but it works very well in cleaning the aquarium glass.
Now, I want to get several of these to have on all my aquariums! Not to expensive at under $7.
Definitely recommended!