Why no air stone or heavy recycling of reservoir water?

Glucose is a major food and energy source for plants and fungi. Our sugar flush contains high levels of glucose which feeds the plant excellently, but also when aerated or recycled heavily feeds the microbes in the air and water, and can create a white film. Our sugar is very strong so you may try reducing the ML per gallon and see if it eliminates the problem.
 
Sugar Flush Glucose Explained
Plants use their roots to pull water and nutrients from soil, but the majority of the plants energy comes from the sun. Plants are able to convert sunlight into usable energy, in the form of glucose, due to the structure of their cells and a process called photosynthesis.

How Photosynthesis Works
Plant cells contain organelles called plastids, which help the cells store energy. Chloroplasts are plastids that contain the green pigment chlorophyll. This pigment is responsible for absorbing sunlight during the process of photosynthesis.

Photosynthesis is a two-stage process. The first stage of photosynthesis is called the light-dependent reaction because sunlight must be present in order for the reaction to occur. During this stage, chloroplasts absorb and trap sunlight, converting it into chemical energy. Specifically, the light is converted into two molecules to be used during the second stage of photosynthesis. These two molecules are nicotinamide adenine dinucleotide phosphate (NADPH) and adenosine triphosphate (ATP).

The second stage of photosynthesis is called the light-independent reaction because sunlight is not necessary for it to occur. In this stage, the two molecules formed during the light-dependent reaction work together to produce glucose. Hydrogen atoms from NADPH help to form the glucose, while ATP provides the energy necessary to synthesize it.
 
The Importance of Glucose
Glucose is a sugar that plants and fungi use for energy. In plants, glucose is produced as a result of photosynthesis. Plants need the energy glucose provides in order to grow and reproduce. Glucose is also required for the process of cellular respiration, in which plants convert carbon dioxide from the air into oxygen.

Because plants rely on sunlight to make glucose, inadequate sunlight can be a problem for plants. To deal with this problem, most plants store glucose inside their bodies to use when sunlight is scarce. Plants usually store glucose as starch. Starch granules can be found inside plant cells, in organelles called amyloplasts.

Without glucose, plants would not have the energy necessary to grow, reproduce or carry out cellular respiration. This means that without glucose, plant life could not exist on Earth.