So, basically, it is your understanding that all substances outside of water and de-chloriantor ( I dont know, you may argue that's detrimental as well) added to the aquarium are harmful to fish.
This is the "basic fish pathology" you are going on about? Um, okay.
This sounds to me more like a generalization made without context.
Its a bit hysterical. Kinda like germ phobs, they cannot distinguish between the healthful, the neutral, and the detrimental. So, as response to all those germs they cannot distinguish between--- they just call everything harmful. Its easier.
You make alot of generalizations in your response to the question of terrestrial/aquatic fertilizers.
You assume all tanks dont need nitrogen and phosphorous without allowing for the vast differences aquariums have in plant mass, types of plants, fish load, etc... Only to say "they are not needed." This is a blanket statement that has no context. Some tanks will use nitrogen/phosphorous up quickly, others do not need any additional dosing. But, it depends on the tank. Thats pretty basic.
Also, what substances are in terrestrial fertilizers ( and not in aquarium fertilizers) that wont be used by aquarium plants? Nitrogen and phosphorous? We already now this isnt true. Tanks will use these two nutrients at different rates depending on variables.
What are these extra substances (not in aquarium fertilizers) that will be detrimental to fish? Nitrogen and phosphorous? [If not these- what are you specifically talking of?] As far as N and P, whether coming from terrestrial or aquatic manufacturer, one should always monitor how much is needed in ones system. Again, due diligence.
You said:
"Excess of some nutrients will cause aquatic plants to shut down assimilation of certain other nutrients. Point being that terrestrial/aquatic plants are different and it is better to understand this and not experiment."
This "shut-down"
of the assimilation of other nutrients due to excess nutrients is way more complicated than you are trying to portray here. It has to do with water chemistry, hardness, alkalinity, types of plants involved in a particular case. Just because you dose with an aquatic fertilizer doesn't make the occurrence of this phenomenon less likely than when using terrestrial fertilizers.
The amounts of nutrients in terrestrial fertilizers are
"likely" to be different? Is this kinda like maybe? LOL.
Can you link me to a study that demonstrates Seachem's ability to eliminate the possibility of leaching of nutrients into the water column as opposed to terrestrial fertilizers ( namely, Osmocote).
Thanks!