Who Gives A Fish Forums

My betta's in a 5 gallon with a sponge filter and a 50 watt heater. It's been running smooth for months, no problems. Just make sure to cycle the tank properly first.

I'd lean towards a rosetail, delta, or possibly a halfmoon. There's a helpful link I came across with pictures showcasing different types of betta tails - https://www.itsafishthing.com/types-of-betta-fish/. Hopefully that helps you narrow it down.

I completely agree with everyone, his fins look healthy and he's absolutely stunning.

I agree that spiky plants can be a hazard, my sibling's Betta had them and I'm pretty sure it damaged its fins. I think it's a good idea to replace them with plants that have softer edges, like live plants or floating plants, to prevent any further damage to your Betta's fins.