If it can horizontally, does that mean it can be placed under gravel/substrate?

No it can’t be under the gravel

I want this for a tank with a beta - no water current. Is this going to work you think?

There is NO fish in existance that can survive and thrive without filtration...even bettas. If you have a betta and no filter, thus no water movement, you are killing your fish. Please...do some research. Don't fall prey to the misinformation that they little guys can live in a puddle. Thats as bad as saying a goldfish can live in a bowl.

Will this overheat a one gallon tank?

I bought it for my 1.5 gallon tank and it made my tank 93 degrees it does not shut off like it's suppose too!

It says under 6 gallons. So if i have a 6 gallon round that a bette stays in would it be good for that?

Bettas should have a MINIMUM of a 3 gallon tank WITH filtration AND heater. It is a myth that they can survive and THRIVE in anything smaller. They really should have a 5 gallon tank but if the tank is well planted with live plants to help with nitrate removal, they can live in a 3 gallon. Please do research on this. There are lots of good videos on youtube on how to take proper care of a betta and what is flat out cruelty. A bowl is basically the equivalent to keeping your dog in a closet and never scooping their poop. Except bettas have to breath it too.

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🌊 Keep your Betta cozy and your tank stylishly stable!

SMART INDICATOR LIGHTS - Red and green LEDs signal heating status, so you’re always in the know.
SAFETY FIRST SUBMERSION - 100% waterproof for worry-free continuous use, protecting your aquatic friends.
COMPACT VERSATILE DESIGN - Fits seamlessly in 1 to 6 gallon tanks, ideal for sleek desktop aquariums.
EFFORTLESS TEMPERATURE CONTROL - Preset to a perfect 78℉ for optimal Betta comfort—no fiddling required.
BONUS THERMOMETER STRIP INCLUDED - Monitor your tank’s temp at a glance—because precision matters.

The PULACO25W is a compact, submersible aquarium heater preset to 78℉, designed specifically for small tanks between 1 and 6 gallons. Featuring automatic temperature control with ±3°F accuracy, it ensures a stable environment for Betta fish. Easy to install vertically or horizontally, it includes red and green indicator lights for heating status and comes with a free thermometer strip. Built for durability and safety, it offers a 12-month warranty and responsive customer support.

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