There isn't really a one size fits all answer. Assuming that you're dosing three times a week, have medium light and you're using CO2 that amount is a place to start. Some will tell you it's too much, others might tell you it's not enough. It just depends on what "method" they prefer and their experience. As time goes on and you observe your tank then you can decide if you need more or less.
There are some who think that "excess" phosphorous contributes to algae and any more PO4 that what you get from fish food and waste is too much and others who think it's best to have more than the plants will use to rule out the possibility of any deficiencies. I add 0.5 ppm/day in my tank with medium light and pressurized CO2. I have no algae issues, IMO, and the plants are healthy and growing. The fish also are healthy, happy, and long lived. Others might see it as too much or too little, but for me it works. You'll have to determine what works for your tank over time as well.
Last edited by Jeff5614; 09-20-2016 at 05:57 PM.