can this stuff go bad? say it got a lil wet and sat that way? said:
I don't know about the ARM stuff, but the Gen X is coral skeleton so if it got wet, or soaked, it wouldn't break down or get mushy. Might end up with mold or something tho.
The best media is a very subjective quiestion. It all depends on preference.
I myself use Gen-X because I like the larger size of the media. I think it allows water to flow less restrictively unlike ARM which can get very compacted in the media chamber.
I also think ARM has more of a tendency to melt with a slip of the CO2 regulator. This is from personal experience.