The more LR you have and the larger the LR the more surface area there in lies providing more places for coralline allege to grow thus leading to more nitrate consumption ultimately leading to the perfect tank environment.
I have found no evidence to suggest that coraline algae aids in NO3
reduction. However, there are certain types of macros that do aid in NO3
reduction via nutrient export. You are correct about the amount of surface area of the rock playing an important part in the overall health of a tank. More surface area= more beneficial bacteria.
If the bioload in the tank is that which would substantiate the total amount of chemical consumption there would be no need to perform PWC to take out bad water. Therefore in theory if the correct amount of LR with coraline alogia covering it versus bioload is achieved PWC can become a thing of the past.
Not really. the correct amount of biological filtration vs. bioload is extremely important in keeping NO3
levels low. However, PWC
bring more to the party then just NO3
reduction. They also serve to buffer Ph, maintain proper CA
balance and replenish depleted trace elements in the water.