what sort of water are you using tap or R/O? how do you prepare your salt mix . airstone , dechlorinator , heater etc?? test ph , and salinity make sure your new water is the same temp as the tank to minimise stress on the critters .
to get nitrates down to least 10 you can do a couple of water changes ie one every 2 - 3 days , dont do too much at once as youll stress out your livestock and death could come .
you could use some nitrate sponge to get them down more as well ..or a denitrifing coil (a diy version is in 3reef articles ) check it out .
I use this stuff called stress zyme ,dont know if many people use it here but i have used for a couple of years with no baddness ..
now the phosphate you can buy this stuff called phos sponge (similar to the nitrate sponge.. i swear by it
) anyways... you get one ladies stocking must be new put the sponge media inside it then put in your fuge or water flow for a week or 2 . it should bring down the levels .
the key to keeping nitrates and phosphates down is all in the way you prepare your top up water / and weekly change!!?
hope this helps
matt
Red Algae popping up every where 
