Sudden PH drop during first lights on

[NAYM]

:?

My 2x250W are as below

XM is the white light & Blueline is the blue light

My photoperiod is typically like this :-

1200hrs Blueline ON
1300hrs XM ON
2300hrs XM OFF
000Hrs Blueline OFF

My PH fluctuation is as below(using American Marine PH Monitor):-
2300hrs-0600hrs 8.35-8.26
0800hrs-1159hrs 8.25-8.23

The problem starts when my Blueline is on at 1200hrs. There will be a sudden drop from 8.25 to 8.15, sometimes can drop till 8.10. But the PH will climb steadily over the course of my photoperiod and reach it's peak(8.35). Stay there till perhaps 0300hrs and start it's gradual decline to 8.26 in the early morning(0600hrs)

Maybe the fluctuation isn't too much of a concern, but I will be interested to know if anyone is having the same situation as myself.


TIA

 

[danmhippo]

Do you have macro algae in your tank? One of the possibility is CO2. When lights isn't on, plants stop taking in CO2 for photosynthesis, and the accumulation of CO2 will suppress your pH during the light off period.

 

[NAYM]

Do you have macro algae in your tank? One of the possibility is CO2. When lights isn't on, plants stop taking in CO2 for photosynthesis, and the accumulation of CO2 will suppress your pH during the light off period.

I am not overly concern over the suppressed PH during the lights off period, I am only curious to find out the sudden drop in PH when my first light turns on at 1200hrs. It's a sharp decline from 8.25 to 8.15(sometimes 8.10).

:mrgreen:

 

[spsmike]

Do you have macro algae in your tank? One of the possibility is CO2. When lights isn't on, plants stop taking in CO2 for photosynthesis, and the accumulation of CO2 will suppress your pH during the light off period.

My opinion does not reflect official positions of RDO. If you can read this line, you probably has nothing better to do, and you need to get a life too .


You need to change has to have nothing better to do......LOL :lol:

 

[Anonymous]

Interesting dynamic. Could be right at first the fish are more active and producing CO2 before the plant life has time to catch up. Then everythign settls down.

 

[Anonymous]

IMO Beaslbob has the answer but I wouldn't limit it to just fish.