Seachem Glass CO2 Beetle Diffuser 30mm

Bubbles are so fine they look like a mist rising through my 90-gallon tank, and the glass is thick enough that I don't worry about cracking it during cleaning. The 30mm disc really puts out volume for high-growth setups, and my plants have perked up noticeably since I switched.

The diffuser disc has a noticeably larger surface area than my old one, and my CO2 levels stabilized within a day. It’s easy to clean and sits flush in the 20-gallon tank without looking bulky.

I was a bit worried about the size, but the 30mm disc fits perfectly in my 40-gallon tank and the fine bubbles are exactly what my plants needed.