Review on 🔹 EHEIM Substrat Pro 2L - High-performance Biological Filter Media (Sintered Pearl-Shaped Glass) by Shannon Connolly

I have never used this aquarium filler. When starting a new Betta aquarium, after some research I decided to try it as a medium in a filter. It worked great. The tank's initial cycle was smoother than I've ever experienced and performance has been stable with regular maintenance ever since. I plan on replacing the HOB filter gasket with this media so it will work as well in the future.