No directions came with my heater....How can I adjust the temp so that it actually sticks?

Use the Button by the outlet side and then press it, it will start to flash press until your at the proper temp then leave it. It will adjust itself

Can i adjust it to set to 78 degrees F for a betta fish?

Dear customer, 78 ℉ is ≈ 26℃ , designed temperature for this heater is 15~34℃，normally, suitable temperature for betta fish is 24~30℃（75~86℉）, we suggest you ask local fish store for more details.

What type of plastic is it made of?

The Plastic is durable, does no appear to be fiberglass filed plastic. How ever the one I purchased is sitting in a box it didn't last much more than a month. an alert message flashed and I removed it as soon as I noticed it. Replaced it with a Cobalt Neo-Therm Heater.

Why is this Heater flashing 00? Tried unplugging and resetting- still does not work.

It flashes till you set the temp you want then it stops. If it keeps flashing then you need to contact seller and send it back.

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Description

🌊 Keep your aquatic world perfectly cozy — because your fish deserve the best!

SAFETY FIRST DESIGN - Auto shut-off when out of water or overheating protects your aquatic friends 24/7.
COMPACT YET POWERFUL - 50W heater perfect for 1-10 gallon tanks, ideal for bettas, turtles, saltwater & freshwater setups.
LONG REACH POWER CORD - 5ft cable ensures flexible placement for any indoor aquarium environment.
REAL TIME LED DISPLAY - Instant digital feedback on water temperature and error codes keeps you in the know.
PRECISION TEMPERATURE CONTROL - External controller lets you fine-tune your tank’s climate without getting wet.

The FREESEA 50W Aquarium Fish Tank Heater is a compact, submersible heating solution designed for 1-10 gallon tanks. Featuring an external adjustable controller with a 63℉ to 94℉ range, dual safety auto shut-off functions, and a real-time LED temperature display, it ensures precise and safe temperature management for bettas, turtles, and both saltwater and freshwater aquariums. Its 5ft power cord offers versatile placement, backed by 24-hour professional customer support.