ODD, snails only eating algae off some rocks

Bob Newbie

Reefing newb
Ok, here is a strange question and hope someone can shed some light on it. I am battling algae and, as suggested, put in some turbo snails. Now the snails are doing a good job but for some reason they are only staying on some rocks and glass but seem to totaly avoid some specific rocks. Furthermore, the specific rocks that they are avoiding are exaclty the lasts ones I purchased (seperate batch) and have th most growth on them. Not only that but when I originally put the snails in the tank I placed severa on one of the rocks and they moved to the others. They have kept several of my original rocks squeaky clean but leave a rock that is nest to it or leaning on it completely untouched. Any help??
 
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