I have the Aqueon 50 watt preset (to 78) heater and it's the perfect size but doesn't believe up to the task. It has to be small around 7 or 8" or under ideally.
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What size is your pico?
3 Best small aquarium heaters for tiny tanks 1 - 10 gallons
Got a tiny tank? You need a small heater. We tested and reviewed over 20 mini heaters to find the best for your small aquariums.fishlab.com
Since you have an inkbird any heater will do (for now) these preset small heaters are cheaper than cheap even compared to regular cheap aquarium heaters. I have a 10w heater that was cooking a 2 gallon before I put an inkbird on it. Another 10w that I've only had for a few months has already died.5 gal. Room temp will be around 73-75. I have an inkbird controller for a heater.