Hey guys, this is kind of a dumb question..but my cousin is restarting his 3 gallon tank, and he asked me for some mature media. I have sponge filters a canister and 2 HOBS. I planned on giving some of the media to him from the 30 but a buddy from the lfs is starting a 55 and asked for some media, so I already gave him as much media as I felt comfortable giving away at one time. I have two HOBS, one on the 10 and one on the 20. Could I take these off and give them to him? Or do they just catch debris and not bacteria? Thanks if you bothered to answer this 