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Python no spill water changer. There's also a Lee Mar and Aqueon brand;however, I don't think they have any in the UK. I've seen people post from the UK looking for water changers and not finding those brands in the past.
I have a clean up crew so to say but that's not the reason I have them. I have synodontis, loaches, and plecos just for bottom dwellers. They do the complete opposite of cleaning. The plecos and synodontis are messier than my cichlids.