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Yes, it is getting slightly yellow. The pH has dropped to 12.60 (I don't know how accurate that is, the meter was calibrated couple of weeks ago @ 7.0 and 9.0)
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Tatu Vaajalahti
Tampere, Finland
Current Tank Info: 240 gal + 50 gal sump,SDSB,LR,ATB Medium, 2x250W HQI + actinic,Balling
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