When it comes to corals and filter feeding invertebrates, having a large bioload can actually help them thrive. While most corals will rely heavily on photosynthesis, not all corals use sunlight to the same extent and invertebrates even less as much. So, things like fish waste and uneaten fish food will be put to good use in a reef tank. For tanks that are devoid of robust fish life, you will likely have to target feed invertebrates and certain corals so that they thrive long term. And be sure to not overlook clams. Although they rely mostly on sunlight, they will still benefit from phyto and zooplankton dosing.