Phosphates spike after water change ??????

Jfarooqpak

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Hi. I can’t seem to understand why my Phosphates spike after a water change. My tank is finishing up a mini cycle that it entered due to me adding a lot of dry rock. Almost all the readings are normal now except Phosphates. They were reading above 1. Then went down to 0.9 then today they were at 0.59 before I did a water change. about 2 hours after the change phosphate was reading 0.9 again. I use Hanna hand held checker.
thank you for your help everyone.
 
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lapin

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So you are adding water that is lower in PO4 and your PO4 level goes up. This is strange.
My next guess is
Pukani Dry Rock which is known to leech PO4
 
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Ok, so ROWAphos claims to not leach phosphates back into the system once exhausted, so we will rule out the ROWAphos. Can you tell us a little bit more about what all you have in your bio cube like fish, live rock, corals, etc?
 

lapin

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Why would you suggest it's Pukani rock, when there's no mention of pukani rock at all?
The OP is not giving us much info, so these are my guesses without knowing all the facts.
Rock absorbing PO4 then leeching is something that can happen.
If its not comming from any new water or substance entering the tank then its in the tank already.
 
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Jfarooqpak

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Ok, so ROWAphos claims to not leach phosphates back into the system once exhausted, so we will rule out the ROWAphos. Can you tell us a little bit more about what all you have in your bio cube like fish, live rock, corals, etc?
12 corals. Small ones. 3 acans 2 Favites and rest all Zoas.
 
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