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Whats the best position for heaters in tanks? I have my heater in the corner of my tank and I realized it's probably heating up that corner and that's it. Vertical or horizontal? Is is better to put it next to the filter so the water circulating will be warm?
 

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Its better to put the heater next to the filter so the heat can circulate. I've heard that placing the heater horizontal is better, but I have mine vertical right next to my filter and they do a perfect job.
 

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I tend to have mine at the back of my tank going diagonal, for example top left corner to the bottom right corner, but I have seen many people who have theirs in a corner vertical. Just make sure to have the part that heats the water at the bottom, not the top like I did once.
 
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