I can't say anthing about the rock but I ordered my IM 100 EXT from IM & Paul was very helpful as well, when I had 2 small issues with the stand he took care of it immediately. On the same note I've ordered a tank & many other items from Marine Depot with out issue. I had 2 48" bulbs arrive broken, they sent me replacements immediately no questions asked & when I had a skimmer on back order for a few months which I had no problem with they gave me 1500 reward points for my patience. I'm sorry you had a bad experience with them but I don't believe that's a norm. Can you just keep the items & buy a similiar tank to the IM that was on back order from someone else, a waterbox, JBJ ect?