I have 200-300 pounds of Imagination rock. these are BIG show rocks! not for the little tanks.. in the pics they are in my 240gal 8ft tank to give you the idea of there size, perfect for your frontosa setup, not sharp like lace rock. one of the larger ones has a nice big cave, others have tunnels, these are to be sold together. all for $100 ofcorse pickup only chicago land area!