With the sera gravel cleaner you can remove waste without water change. The sera gravel cleaner can be connected to any standard air-pump. Suitable for all aquaria up to a height of 60 cm..https://www.aquaristikshop.com/aquaristic/Sera-vacuum-cleaner/388007/
- Euripides M. wrote about Sera vacuum cleaner in 2016:
It works quite well when combined with a medium-strong air-pump.