Fish POO in the water. That is the reason why filters and water changes are both necessary if you wish to keep fish successfully. The filters use bacteria to remove the ammonia and nitrite which are bi products of fish pooing and breathing in the water. The syphoning off from the bottom of the tank removes the decomposing detrious (including Phosphates). Whatever is left can usually be used up by healthy growing plant life in a balanced aquarium.
Aquarium water is generally more rich in nutrients such as phosphate and nitrate than tap water, and these serve as food for your plants. Basically aquarium water acts as a mild, natural plant fertilizer
The most common cause is bad water conditions. (Insufficient water changes/poor filtration etc.)
I would add water to the trisodium phosphate. If it were an acid, then I would add the acid to the water.
Please mention the type of phosphate.
It could be due to illness, or poor water quality
No, because if you boil a water and put it in the aquarium the tendency is the aquarium will crack.;) SO EASY!
Garden soil is not suitable for an aquarium (tropical or cold water aquariums). The soil will pollute and cloud the water with soil particles, debris and live organisms that could cause disease to the fish. Only use special aquarium equipment and ingredients: washed gravel, etc.
The diammonium phosphate is water soluble.
it provides an excess amount of phosphate
Add an aquarium heater. Make sure you choose a heater with the correct wattage for your aquarium's water volume.
Fortunately phosphates do not directly harm your fish, even at high levels. However, the algae blooms that result from elevated phosphates can ultimately cause problems for the aquarium inhabitants. For instance, green water can deplete the oxygen, which in turn can harm the fish.
diammonium hydrogen phosphate