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Is this normal??

This is lights on for about an hour, note the "rusty" pigmentation.



This is 7 hours later, same camera, same settings. same ligting, note the total absence of the "rusty" pigmentation.

 

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I have also observed this in Bacopa caroliniana in a tank with 55g, DIY CO2, and 1.75 wpg with a 96w PC from AH Supply. The plant would be deep pink in the mornings and turn lemon green in the afternoons right before the lights went off.

I tested for PO4 and NO3. I found my PO4 to be practically unmeasurable. My NO3 was 5 ppm.

I started dosing small amounts of PO4 in the mornings. I noticed that a few hours later, the Bacopa began to turn lemon green earlier in the day. I added more to the point of having 0.5 ppm. The Bacopa was no longer pink in the mornings (nor have such short internodes).

Just my experiences,

Carlos
 
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