Phosphates !!


New member
I lost my phosphate api color chart but I'm pretty sure that's 10ppm[emoji51]I have lps and soft corals in my nano reef ,this could be why a lot of them aren't opening up,even my new gsp and Xenia aren't opening .

What do I do ,could all of my coral die

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New member
Phosphates !!

Looks like between 0.5-1.0, I can't see clearly though...

Maybe a water change is needed.


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Sugar Magnolia

Mother of Dachshunds
Staff member
RC Mod
Looks like .50, run some phosguard.

On another note, if you could please shrink your pictures down a bit before posting? The huge pictures make it difficult to view the text. Thanks.


Premium Member
I like API for Alk, pH and calcium but when comparing API's phosphate to other test kits like ELos and Nyos it's been inconsitant or at least difficult to read. I would recomend getting a differnt test kit. When using Elos or Nyos to test higher levels you can use 2 - 4 parts of distilled water to 1 part of tank water then multiply by whatever was used. Keep in mind corals can become phosphate deficient if it's dropped to low. Here's a video and links to research on corals and phosphate:
An Experimental Mesocosm for Longterm Studies of Reef Corals

Phosphate Deficiency:
Nutrient enrichment can increase the susceptibility of reef corals to bleaching:

Ultrastructural Biomarkers in Symbiotic Algae Reflect the Availability of Dissolved Inorganic Nutrients and Particulate Food to the Reef Coral Holobiont:

Phosphate deficiency promotes coral bleaching and is reflected by the ultrastructure of symbiotic dinoflagellates

Effects of phosphate on growth and skeletal density in the scleractinian coral Acropora muricata: A controlled experimental approach

High phosphate uptake requirements of the scleractinian coral Stylophora pistillata

Phosphorus metabolism of reef organisms with algal symbionts

Sponge symbionts and the marine P cycle

Phosphorus sequestration in the form of polyphosphate by microbial symbionts in marine sponges