Available in either 250ml or 500ml bottles, you can use Easy-Life Fosfo to easily compensate for phosphorus deficiencies in your aquarium water.
While high levels of Phosphorus in your water can be a bad thing, so can a drop in levels too, as Phosphorus is needed in your tank water as small amounts of it are needed by the organisms in your tank to live - it's one of the basic building blocks of life!
Too much of it can cause a lot of algae growth, but too little can be a problem too as it inhibits your live aquarium plants from thriving. You'll often find these levels can change rapidly in an aquarium, especially one that is very low stocked on fish, or a planted only set up, especially the popular Shrimp tank set ups.
Phosphate levels are generally best kept low unless you are keeping a fish-free tank or one that is low stocked, in which case the phosphorus is going to be being produced in your fishes waste. This should be used weekly, at 10ml dose per 500l of aquarium water, which should increase the PO4 concentration by 0.1ppm.