Seachem Glass CO2 Bubble Counting Diffuser

The low-profile design really does the trick—it's tucked behind my plants and almost invisible, yet the bubbles are still easy to count at a glance. Setup took me under two minutes, and for my 20-gallon it's been flawless.

Saw the CO2 bubbles rising from this low profile diffuser within seconds of connecting it, and it's barely visible against the back glass of my 20-gallon tank. Such a simple way to keep tabs on my CO2 levels without bulky equipment.

Setting this up was a breeze, and I love how easy it is to read the bubble count to dial in my CO2 levels. It's really slim, so it barely takes up any space in my 20-gallon tank.