anyone else using OCN Frozen suh as Prime Reef or Formula Two? I have a couple different packs i picked up from different stores and they are all the same. The cubes are like rubbery when you take them out of the package? none were thawed then refrozen, some have gel binder and some dont. it take a little effort to break these down to feed or are they just made to be used with the Feeding Frenzy Clips?