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Old 03-15-2008, 09:31 PM   #1 (permalink)
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Default What do PH fluctuations mean?

I have 4 tanks, from 4 months to over two years old. They have been low-light, low tech, just flourite and good wishes. One month ago I upgraded the lighting on two, and doubled up the old lights on the other two. I have two on DIY yeast set-ups, one which works and the other is inconsistent. I have been checking the PH morning and night for the last few weeks, and the 20 gallon that I put 48w of T5 on fluctuates from about 7.2 in the morning to 8.0 at dinnertime, every day. It is the one with the sputtering DIY system, that hits 4 BPM on a good day. All of the others sit steady at about 7.4 all the time. Two others are higher WPG, including the one with working CO2. Everything seems fine with the 20 gal, the adult algae eater has grown over 1/2" this month! The anubias look like green velvet. I guess I am just wondering if something is going right, or if something is lacking.
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Old 03-16-2008, 09:30 AM   #2 (permalink)
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Default Re: What do PH fluctuations mean?

48 watts of T5 light on a 20 gallon tank is high light intensity, requiring a good consistent supply of CO2 to avoid lots of algae problems. A higher watts per gallon (T5) would need consistent CO2 even more. The fluctuating pH is likely a result of fluctuating concentration of CO2 in the water, which is an open invitation to algae. The "green velvet" anubias would seem to be algae accepting the invitation.
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Old 03-16-2008, 10:13 AM   #3 (permalink)
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Default Re: What do PH fluctuations mean?

The pH is going up during the day because the CO2 consumption of the plants is greater than the CO2 production by your fish and yeast generator. You must have either fewer plants, more fish or better CO2 generators for the other tanks.
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Old 03-16-2008, 08:54 PM   #4 (permalink)
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Default Re: What do PH fluctuations mean?

I see... are the T5 lights brighter than compact flourescents somehow? I have two 65w Aqualights (all of these are 6700k bulbs) on a 50 gal right next to the 20g, and the 20g looks brighter. They are both maxed out with fish, and about evenly planted, so I guess the plants may be responding more to the T5s? I should have both of them on pressurized CO2 by the end of next weekend. Maybe I will buy Bubba some algae wafers, just in case the CO2 does the trick. Thank you for the info!
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