I just removed it from my sump. I am not sure if it actually did anything other than make a mess. I replaced it with Brightwell NO3 brick and just left the Java moss floating freely. With the amount of water changes we do with Discus the whole plant/nitrate removal thing seemed to be counter productive with the mud that was getting everywhere in the sump. I have learned you really want to keep things as clean as possible with the Discus. Just my personal opinion but I have not seen anyone here who loves it let alone would put it in their main tank as a substrate. That would be impossible to clean and I would think it would just foul your water and your filters and pumps.
Do you have substrate now? A planted tank? Just curious as to why you would want it in your aquarium.