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02/21/2006, 04:25 PM
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#1 |
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Registered Member
Join Date: Jan 2005
Location: Cleveland, OH
Posts: 1,173
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Big Trouble!!!! pH swing 8.1 - 8.7 daily
Yeah, that's correct. Morning's the pH is at 8.1 - 8.2. By 2-3 in the afternoon it is creeping higher and higher until at night it peaks at 8.6-8.7.
75gal 8 fish, 2 are 2-3", 5 are 1-2" Temp 79 Sal - 1.024 Alk - 2.86 Calc - 390 Mag - 1280 I added T5's last week, and have been using boxes of Tropic Marine Pro - makes 50gal's, instead of the huge buckets I used previously. Have been running chemi-pure, but removed that finally. Sumpless system, no macro, Barracuda and Red Sea HOB skimmers. I'm kinda desperate here!! Thanks for any help. Never had a problem remotely resembling this.
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Amy. Current Tank Info: Numerous past tanks (down to nano now) |
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02/21/2006, 04:39 PM
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#2 |
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Reef Chemist
 
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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More aeration will reduce or eliminate the pH swing.
How are you supplementing alkalinity?
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
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02/21/2006, 04:49 PM
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#3 |
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Registered Member
Join Date: Jan 2005
Location: Cleveland, OH
Posts: 1,173
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Randy, I'm using baking soda, and always do everything based on your calculator. There is a lot of aeration, but I'll start more. I do a lot of water changes also. I'll add a couple more pumps and report back!
thx..
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Amy. Current Tank Info: Numerous past tanks (down to nano now) |
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02/22/2006, 07:49 AM
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#4 |
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Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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The high pH end of the swing represents carbon dioxide being used up during photosynthesis. More aeration will bring in CO2, and reduce that pH maximum. Raising alkalinity will also reduce the pH swing, so you might air for 3-4 meq/L.
 How are you measuring pH?
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
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