I just tested my PO4 level and it is at about 1.0 ppm right before I did a water change.What is a good level?Reason I am asking is I over did it a couple of weeks ago and I am getting it to come down and was wondering what ppm I should be trying to get it to.My tank is 20 gal. with pressurized CO2 with 3.5 watts per gal.if thats needed for any help.

It depends on a few factors, what is your NO3? If is around 10ppm then you are in a good range, you want to shoot for a 10:1 ratio. If you start to see green spot algae then you know that you need to up your PO4 a little.

I gave a 20 gallon with 65w and I keep my po4 at 2ppm. If I forget to dose a day, I get GSA all over the glass.

My NO3 is at 10ppm and my NO4 is at 1.0 ppm after the water change.

Your levels are fine. How are your plants?

Mike

Plants are ok,corkscrew vals are a little week but I think that might be from transfering them from one side of the tank to the other.Getting a slight case of spot algae on some of the plants.