MermaidMel
Official Forum Weirdo Detective
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Hrm, presuming the light is fixed, you could potentially squeeze an Azoo Mignon 60 or Aqua Vital 160 next to it (which are 3.5" across) or go for something bigger at the side.
The light is overhead and separate from the unit
how often do you have to water change these tanks without a filter mel?
I do each tank once every 5-7 days