Yes but it'll also allow your corals more chances absorb the uneaten food.
Also just to clarify my points a bit - I'm not saying phosphates are bad - your tank still needs it for various processes and that's why other have recommended to "keep a little bit" as detected on our test kits. When it tests 0, the conclusion that your system "needs more nutrient" is a fair one but the challenge is that we are not sure which part of the nutrient process from "when you put food in" to "po4/no3 showing up on test kits" is experiencing deficiency since our test kits is only showing how much po4 is left in the water and not how much P is available for our organisms to absorb at each stage of this process. Since the formation of Po4 happens later in this process and we can't be sure if the deficiency is occurring before or after this step, feed more will ensure that the full process is covered and whatever excess food that the earlier steps can't process will be naturally broken down to no3 and po4 that the later steps needs. Directly dosing po4 will only address the issue of the deficit is occurring on the later steps.
Thats part of the challenge for the reefing hobby - the test kits only show whats left in the water and doesn't really tell us what is really happening in our tank. We have to interpret these results and make educated guesses based on our research. Its this trial and error and you learn along the way but thats what makes this hobby fun. Enjoy the journey =)