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Placement can affect heat distribution. Ideally, position it near the filter outflow to help circulate warm water evenly. Horizontal or vertical doesn't matter as much as ensuring it's fully submerged and not touching the substrate. What kind of heater did you get?


Totally agree. Circulation is ...

Heater placement is key, especially in smaller tanks. If it's too close to the substrate, it can overheat the bottom layer. I'd go vertical near the filter outflow, but avoid direct contact with the glass. What brand heater are you using?