Hello, was hoping someone could help me! I got a baby biorb last christmas, but the fish I got had some sort of louse-bug on them and they died pretty quickly before I could get rid of it Ever since then it's been sitting empty, so I thought I should probably put it to good use! I've since moved about 3 times so the instructions are long gone! I've put water in, put the chemicals in it comes with (I had to get a replacement bowl as it got smashed) and I've had the pump running a few days now. I've got to buy one of the sponge filter things. However I've been looking on the net, and as far as I can gather I should also buy the grey rocks material that I got with it the first time round, long gone by now! Do I have to buy some more? If it needed, how long do I leave it in before I add fish? Any help will be greatly appreciated!