<span style="font-family: Verdana;">I got some media with mi reactor mainly ARM but also Koralith. On the bags I got it say Karolith in 1st chamber and ARM in 2nd. From other post I see most are using ARM in both chambers.</span>
<span style="font-family: Verdana;">What is the difference between the media and what is the importance of media in 1st vs 2nd chamber?</span>
<span style="font-family: Verdana;">What is the difference between the media and what is the importance of media in 1st vs 2nd chamber?</span>
