They probably won't care really. You may get an appology but I doubt it. Most online store post the best looking rock they have under picture perfect conditions, like maybe some actinic light overhead and so on. It will all color up with some time. In a tank that small stick to picking out each piece yourself locally. You don't have to buy it all from the LFS either, buy a piece or two here and there when people break down or sell off surplus.