Betta Fish are really hardy creatures. They don’t commit Harakiri or die without a reason. Unless your betta fish is like 7 years old it’s died because of some other reason. Here’s a few common reasons for these Sudden deaths.
Aquarius Aq15005 5-Gallon Aquarium is a perfect Betta fish or other small mini-crabs, dwarf crayfish or beautiful shrimps. It comes with fully closed hood with LED lighting and also with a filter so you get a complete set and cost you less than $25.
Hydor 25W Submersible Aquarium Heater one of better quality heaters you can find in market. Their 25W heater is great for any Betta fish tanks or bowls from 2 Gallons or higher. Also they do have heaters for bigger tanks too. It’s worth buying a good heater so your fish can survive winter cold.