I have an established 55g with two clowns, two bannerfish, a regal tang, and numerous inverts. I would like to add about 20# of LR to my already 35#. I am questioning if I can buy online at places that sell 'cured' LR like LR.com, Tampa Bay Saltwater, or Premium Aquatics and then just add it to the tank? However, I do not want to put my inhabitants in danger. It is safe to add that amount of rock if it has been out of the water for a day or so as long as I watch for nitrate spikes and do water changes? Also, has anyone ordered live rock from tampa bay saltwater or premium aquatics before? I have heard great things about each and wish to add something other than my 35# from lr.com. Thanks.