Phosphate suddenly dropped

BRS

Lavey29

Active Member
View Badges
Joined
Apr 29, 2021
Messages
335
Reaction score
166
Review score
+0 /0 /-0
Location
United States
Hi everyone, I have a new tank that has been running for 3 months. Only 4 fish and 5 corals in a Red Sea XL300. I was using RedSea AB food every other day in a small dose and also dose phytoplankton at night. My phosphates went very high at .52 on my Hanna checker. I stopped the coral food and phytoplankton for a week and did my normal 15% water change. My phosphate is now 0. I ran the test several times. I siphoned the substrate pretty good but why the rapid drop? I know it's not good for my inverts. I had a very mild stage of diatoms when the level was elevated.
 
RAP

christianscorals

Community Member
View Badges
Joined
Apr 19, 2021
Messages
59
Reaction score
114
Review score
+0 /0 /-0
Location
los angeles
Hi everyone, I have a new tank that has been running for 3 months. Only 4 fish and 5 corals in a Red Sea XL300. I was using RedSea AB food every other day in a small dose and also dose phytoplankton at night. My phosphates went very high at .52 on my Hanna checker. I stopped the coral food and phytoplankton for a week and did my normal 15% water change. My phosphate is now 0. I ran the test several times. I siphoned the substrate pretty good but why the rapid drop? I know it's not good for my inverts. I had a very mild stage of diatoms when the level was elevated.
depending on what coral food you use, it tends to be real heavy in phosphates so that could’ve been your biggest contributor to such high phosphates. if you aren’t dosing live phyto that is also going to affect your phosphates. cutting this routine makes sense in such a decrease of phosphates over the period of time and i’d recommend you find a middleground to your routine where phosphates are not bottomed out at 0 but also not crazy over board
 

Timfish

Crusty Old Salt
View Badges
Joined
Jul 22, 2012
Messages
1,483
Reaction score
1,991
Review score
+0 /0 /-0
Location
Austin, TX
There's all kinds of stuff in your tank that use phosphorus. Corals, sponges, biofilms and all kinds of microbial stuff, inverts, fish, fungii. Reitterating the above post, experiment to find a middle ground that keeps your corals happy. This pic may help understand phosphorus cycling in photosynthetic animals (keep in mind we can only test for inorganic phosphorus).

DIP DOP POP.jpg

Maybe you've already seen some of this material but here's some videos you may find informative:

Forest Rohwer "Coral Reefs in the Microbial Seas"

Changing Seas - Mysterious Microbes

Nitrogen cycling in hte coral holobiont

BActeria and Sponges

Richard Ross What's up with phosphate"
 
OP
Lavey29

Lavey29

Active Member
View Badges
Joined
Apr 29, 2021
Messages
335
Reaction score
166
Review score
+0 /0 /-0
Location
United States
depending on what coral food you use, it tends to be real heavy in phosphates so that could’ve been your biggest contributor to such high phosphates. if you aren’t dosing live phyto that is also going to affect your phosphates. cutting this routine makes sense in such a decrease of phosphates over the period of time and i’d recommend you find a middleground to your routine where phosphates are not bottomed out at 0 but also not crazy over board

Thanks for the reply which I agree with. I tested at .52 then did my water change the next day. The following day I dosed REd Sea AB food and tested later at 0. Does that seem like a normal drop over 2 days? I am now dosing only twice a week to find common ground.
 
OP
Lavey29

Lavey29

Active Member
View Badges
Joined
Apr 29, 2021
Messages
335
Reaction score
166
Review score
+0 /0 /-0
Location
United States
There's all kinds of stuff in your tank that use phosphorus. Corals, sponges, biofilms and all kinds of microbial stuff, inverts, fish, fungii. Reitterating the above post, experiment to find a middle ground that keeps your corals happy. This pic may help understand phosphorus cycling in photosynthetic animals (keep in mind we can only test for inorganic phosphorus).

DIP DOP POP.jpg

Maybe you've already seen some of this material but here's some videos you may find informative:

Forest Rohwer "Coral Reefs in the Microbial Seas"

Changing Seas - Mysterious Microbes

Nitrogen cycling in hte coral holobiont

BActeria and Sponges

Richard Ross What's up with phosphate"

Great info,thank you
 
Top Shelf Aquatics
BRS

Do you house a "Reef Safe" Angelfish in your reef tank?

  • YES and it's going good

    Votes: 3 42.9%
  • YES but it's not working out

    Votes: 0 0.0%
  • NO I have tried it in the past and it didn't work out

    Votes: 0 0.0%
  • NO I haven't tried yet

    Votes: 4 57.1%
  • Other (please explain)

    Votes: 0 0.0%
Legendary
Top