I have been trying to come up with a way to better clean my nanos as a large hand man sometime it can be quite challenging. So I took a regular pen cut it up and stuck it in a 1/4 tube to slow the siphoning in my nano. This worked like a charm. I’ve had some bubble algae that was impossible for me to reach it’s all gone now with ease. Just wanted to share as this is going to be a tremendous asset to me moving forward in how I care for my tank.