I have very good access to a bunch of mature fish tanks. Ive been meaning to add something to mine from one of them to give the cycling a boost. The only problem is, none of the gravel i can get is the same color and that of the gravel i have, and im not sure how i would use media in my tank, since i have a whisper, and none of the tanks i ahve access to have this type of filter. Is it posible to maybe put some matured rocks in a net like thing and put them in my aquarium somewhere, or maybe a small hanfull of them in the filter.. any ideas? Also, would an ornament from an established tank work as well? And if im unsure of exactly what could be lurking in a tank, are there any precations i should take? there is currently salt in my tank treating ich, so im not worried about that getting in my tank.