The Hygger Aquarium Air Stone is a great choice for your sativa, as it produces ultra-fine bubbles that improve oxygen levels, helping prevent issues like curling tips. It's durable and efficient, making it ideal for your needs.
Other top options include:
Pawfly Nano Air Stone Disc: Reliable with uniform bubble distribution.
VIVOSUN Air Stone: Effective with high-output pumps.
Aquaneat Nano Bubble Stone: Affordable with ultra-fine bubbles.
All these options are excellent for enhancing oxygenation in your hydroponic setup.