The amount of live rock won't be the cause of the slime. The amount of LR has ore to do with the amount of livestock in the tank than the water volume of the tank.
What are the additives you added for? I am not familiar with them. If one of them is a carbon source they could be the cause. (It's not carbon for filtering it's Carbon source like vinegar or Vodka to increase the bacteria in the Aquarium)
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