High Phosphate and fish

Does anyone know the impact of high Phosphate (3.0 or higher) on fish 
health?  I have a test tank with a peat/vermiculite/clay mix and have found 
Phosphate readings (Red Fish Pharm) around 2.0.  After transfering the 
plants to the new tank (so I see the root development) I will report to the 
list on the results.
Rochelle Williams
williaro at ftmcphsn-emh1_army.mil