Just an FYI but if you're keeping any corals fish poop is thier preferred source of nitrogen and phosphate and fish poop is also an important component of the carbonate cycle on reefs. Here's links if you want to read more:
"Forget what you know about phosphate and nitrate"
COntext dependant effects of nutrient loading on the Coral-Algae mutualisim"
(Nitrate dosing can shift coral-algae mutualism to a parasitic relationship in favor of the algae.)
Request PDF | Context-dependent effects of nutrient loading on the coral-algal mutualism | Human-mediated increases in nutrient availability alter patterns of primary production, impact species diversity, and threaten ecosystem function.... | Find, read and cite all the research you need on...
www.researchgate.net
"Fish as major carbonate mud producers and missing components of the tropical carbonate factory."
Carbonate mud is a major constituent of recent marine carbonate sediments and of ancient limestones, which contain unique records of changes in ocean chemistry and climate shifts in the geological past. However, the origin of carbonate mud is controversial and often problematic to resolve. Here...
www.pnas.org
Here's the oldest system I've maintained without a skimmer: