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post #1 of 3 (permalink) Old 01-18-2006, 06:41 PM Thread Starter
Algae Grower
 
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Big tanks and bpm

Looked through the search and could not find an answer to this.

Tank 130 gal wooden canopy
Lighting trichromic 2X95W VHO timer 9 hrs day
2X110W VHO timer 12 hrs day
filters ehim 2026 with co2 reactor on out flow, spray bar below surface pointed down
fluval fx5 (~600 gph) just above bottom
powerhead just below surface to keep scum off, min surface disturbance
co2 pressurized steady flow ~6bps timer 1/2 hour before and after lights
Tank par gh 300ppm
kh 190 ppm
ph 7.4 to 6.9
tap water gh 300
kh 190
ph 7.4 from tap 8.2 after 24 hours
WC 50% weekly
PH testing done with electronic PH probe.
plants are a mixture of stem, swords and crypts. Growth so so, alge bba and green on glass.
Substrate and rock work has been tested with muriatic acid to ensure that it will not react with the co2 and increace the buffer.

Is it normal:
1 to need such a high bpm count
2 to take 2 days to move PH after WC. 50% sunday PH 7.4 PH(tankreading) does not drop to 7.0 until some time on Tuesday.

If any more information is needed I will try to find it.
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post #2 of 3 (permalink) Old 01-19-2006, 01:52 AM
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Don't get hung up on bubble counts. If your CO2 levels are where you want them and you have no leaks then just accept that's what it takes.

But taking two days to lower the pH? How are you diffusing the CO2?
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post #3 of 3 (permalink) Old 01-19-2006, 02:58 AM Thread Starter
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I am using a 20" long 2" dia reactor with the output from the 2026 entering from the top and exiting the bottom and the co2 fed in about 2"from the bottom. The ph gets to 7.0 / 6.9 and remains steady until the next water change then the cycle repeats itself.
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