phosphate high and algae build up

hello everyone was hoping to gain some advise have had a new setup for the last 6-8 months it is a 5ft bow tank that holds around 450 litres i belive i have a deltec 600 protein skimmer that works very well also a fluval fx5 cannister filter system also 2x power heads and halide lighting system was told that i would get a bit of algae build up due to new setup but algae is now i belive gettin worse just done water test nitrate and nitrite are perfect but phosphate very high over 10 which i belive is the reason for algae also noticed air bubbles over rock dont have any media in filter as told dont need which i think is not write any good info that you may help situation ps sorry for the long messag many thanks

 

If your phosphates are really over 10 don't add anything else yet until this is under control. That high of phosphates can kill or harm hard corals. First, are you using RO/DI water? or tap water? Other source? Second, you can start by running ferric oxide in either your filter or you can get a separate reactor for it. That will help to get the phosphates down, but in order to keep them that way, you need to find the source of the problem. How much and how often do you feed too?

 

i have always used ro water i feed the 10 fish i have 3 frozen cubed brine shrimp dont have any coral just around 85 kilos of ocean rock thanks den

 

Do you defrost the food in ro water and then drain before adding tank water? The frozen food is usually coated in a phosphate based preservative. Soaking the food and draining should help remove the preservative.

 

All good advice. I would add. .. check the phosphate of your RO water and TDS.. just to make sure filters are doing their job.
If it's good water I would do a series of large water changes and cut back feeding.

Also just to clarify... is this new tank diatoms(brown algae) or more like green hair algae.. A pic would be great.
Diatoms will just go away by themselves but either way get on top of the PO4.

 

yes i do use the fish tank water to defrost the frozen cubes and is ro but have no media in fx5 could this be the problem

 

more like thick green algae covering the rock and sand have had little air bubbles all over looks like glittering chrystals but green and now a little red algae covering have turned lights of since yesterday and will be getting some phosphate media for my fx5 would this help thanks den