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Ph question

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  • Ph question

    So my 75g has a turnover of about 2 times an hour. I have a slight surface scum of white specs, decomposing food, and algae. Im going to be replacing my low flow pump with one which should push about 10 times the system volume an hour. Im expecting and hoping that this increased flow rate will remove the surface skum, and push phosphates to the refugium where I grow chaeto. Currently my PH sits at a steady 7.9. Is it safe to expect that with a higher turnover, and potential removal of the surface scum, greater surface agitation, etc, can I expect a higher PH and a better export of phosphates in the tank over what I'm currently getting with my 2x turnover?

  • #2
    other then the return pump what flow do you have in it? Sounds more like you need greater surface agitation from a flow pump, not necessarily more turnover from the return. Dont relay on your return for all your flow. The return pump is only to feed the equipment in the sump, low flow is generally okay for this purpose, but you need pumps pushing and agitating the surface in the tank, which will export the scum to the sump better and ensure better gas exchange, which may increase ph


    • #3
      I have three tunze powerheads rated at roughly 750 gph off the top of my head. I have two pointed behind the rocks facing each other, and the third, plus the return jet pointing towards the front of the tank agitating the surface. There seem to be scum eddies I cant get rid of no matter what direction I have the powerheads pointed.


      • #4
        PH is nearly solely a byproduct of the ambient CO2 in the air in your home. This will not likely help.

        Don't worry about PH. Seriously - you can do more damage chasing it. Keep the alk steady and just forget that PH exists.


        • #5
          Originally posted by jda123
          PH is nearly solely a byproduct of the ambient CO2 in the air in your home..
          My experience with kalk dosing suggests otherwise, but that might be the exception. I would totally agree with your main point - don't worry about PH.

          Sent from my iPhone using Tapatalk


          • #6
            More dissolved o2 in the water should boost pH. Lots of powerheads are not going to do anything if you don't have surface disruption/agitation. Need to increase surface contact between water and o2 molecules.

            Got a window nearby? I once ran a 10 foot air line to an outside window that was quite drafty. Lots of outside air coming through that sucker!! I just taped the line to the wall and let it pull air from near the window. Nobody could see the line because it was behind the couch. The other end of that air line was connected to my skimmer. It did help, but only about 0.2--0.3 on the pH scale. You could set an air pump near a drafty window or other source of outside air. Run a line and an airstone to the skimmer section of your sump. The sump baffles will take care of any bubbles.

            Agree on keeping your alk in check. I used to use a SeaChem product. I can't remember if it was Reef Buffer or Reef Builder. I think it was the Builder.


            • #7
              Arh--- I hate not being able to edit posts. I forgot to add this in my last post.

              Do you have a refugium on a reverse light cycle? Some type of photosynthesis 24/7 will help with pH as well. Macroalgea produce o2 when the lights are on. If you have a refugium full of macroalgae and run it on a reverse lighting cycle, it should help your pH because your o2 levels will be more constant. The pH levels can swing up and down if all is dark at the same time.


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