Anerobic bacteria levels do not increase dramatically at simple differences of 65 versus 75 or even 85 F. However DO levels vary greatly between temps and higher DO levels raise the mumber of aerobic bacteria. Hpowever aerobic bacteria are not and u issue other than at higher temps they use more DO so they lower the alradt y low DO causes by higher temps. The problems lie in water with nearly no DO as this will mean there will be parts of the system thatwill likely be anoxic (anoxic means oxygen free). This means anerobic bacteria. Where you have anerobic bacteria in contacy t with roots you have root rot. People add chlorine or Hydrogen peroxide to kill anerobic bacteria and to oxidize the dead root tissues. Lowering the temps will not kill the bactertia but merely slow their eproduction. The bacteria can even be frozen and thawed without being killed. Higher water temps will not effect root nutrient uptake much except in its effect on nutrient water DO. Out side of DWC, bubbleponics and standard NTF water temperature as high as plant temperatures down to 15 or 20 degress F below plant temps is considered fine. With DWC, bubbleponics, small tube low pressure aero and standard NTF lower temps might be necessary than plant temps to maintain adequate water DO levels. Typically only when temps start droppoing down below 55 to 60 degrees F do people waorry about low temps, unless they are running a hot grow room with CO2 etc, then they might keep temps up to 70 or 75 degree F with heaters. Few people run grows above 90 degrees F so 70 F is usually adequate.
should i warm my resivior ?? i have a 25 gallon ebb and flow system and was wondering if i should warm my resivoir water..my rooms runs77 degrees day and 66 night.. i have a heater in there running at 70 degrees. Does this sound ok, or yank it? thanks, purp kush ,1000w hps, 6 pack meds.
