"Think of a protein skimmer, also known as a foam fractionator, as a super-powered pre-filter. Its main job is to remove organic waste compounds—like fish waste, uneaten food, and decaying plant matter—from the water before they have a chance to break down into harmful nitrates and phosphates.
It’s a proactive approach to filtration, tackling the problem at its source. While your biological filter is essential for converting toxic ammonia and nitrite, the skimmer removes the fuel for that fire in the first place."
https://aquifarm.com/freshwater-aquarium-protein-skimmer/
"When thinking about the reasons for aeration, the primary reason is to increase the amount of oxygen in your pond. There is a delicate oxygen balancing act that occurs in many ponds every summer. This diurnal oxygen cycle is reliant upon photosynthesis to provide oxygen during sunlight hours. After dark, no oxygen is being created but all things aerobic are still respiring. Fish kills can occur when all of the oxygen is depleted before the day breaks."
https://www.wildlifedepartment.com/outdoorok/ooj/benefits-pond-aeration
"In any type of enclosed aquatic system, the removal of nutrients is vital as their accumulation can result in toxic conditions. Plants with a high metabolic rate can significantly reduce pressures on both artificial and bio-filters as they are simply hungry for nutrients.
These plants also compete with algae, keeping their growth to a minimum and thereby preventing algal blooms. They can be placed in strategic areas where both their physical and functional attributes are maximized."
https://pondinformer.com/plants-that-clean-water/