Tank Ph low - why? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-29-2005, 07:27 PM Thread Starter
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Question Tank Ph low - why?

I had this 10 gal tank launched end of December 2004. Ph was 7.0 - 7.2.
For the last 3 months or so Ph dropped to 6.5 - 6.7. I checked my tap water, it didn't change: 7.0 (7.2 de-gassed)

Each time I do w/c, my tank Ph would climb up closer to 7.0, then slide down to 6.5 over next few days. Why is this happenning?

Tank specs in signature.

29g eco, DIY up to 81W PC (55W used), Rena Filstar XP2 Filter
Corkscrew Vals, 2 angels, 4 corydoras aeneus, Ramshorn snails, MTS
5 gal RCS tank with sand bottom, java moss, small internal filter, MTS, Ramshorn snails.
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post #2 of 7 (permalink) Old 06-29-2005, 07:38 PM
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What is your tank's KH? Compare that with your tap's KH. If it is lower then you can expect the pH to be lower as well.
Any phosphate buffers being added? Some dechlors may contain phosphates.

Fish and bacteria produce CO2 through respiration, so matured tanks can expect to have slight pH lowering. Also high nitrates or basically dirty filters and infrequent water changes can cause pH too fall. But the above first two scenarios are the probable reasons first.
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post #3 of 7 (permalink) Old 06-29-2005, 07:43 PM
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Oh and I forgot the most obvious detail in your sig. If you are injecting CO2 the pH will be lowered.
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post #4 of 7 (permalink) Old 06-29-2005, 07:48 PM Thread Starter
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Quote:
Originally Posted by Rolo
What is your tank's KH? Compare that with your tap's KH. If it is lower then you can expect the pH to be lower as well.
I'll check that when I get home.

Quote:
Originally Posted by Rolo
Any phosphate buffers being added? Some dechlors may contain phosphates.
No buffers added. I use the same dechlorinator (Start Rite i think) for my 29 gal with eco-complete and pH is fine there.

Quote:
Originally Posted by Rolo
Fish and bacteria produce CO2 through respiration, so matured tanks can expect to have slight pH lowering. Also high nitrates or basically dirty filters and infrequent water changes can cause pH too fall. But the above first two senarios are the probable reasons first.
Nitrates are low < 5ppm. I am actually started dosing a little bit.
Filter is cleaned with weekly w/c (rinsed in old tank water). No carbon in filter bag.
I didn't think respiration could lower pH by this much.

Edit: No CO2 injection.

29g eco, DIY up to 81W PC (55W used), Rena Filstar XP2 Filter
Corkscrew Vals, 2 angels, 4 corydoras aeneus, Ramshorn snails, MTS
5 gal RCS tank with sand bottom, java moss, small internal filter, MTS, Ramshorn snails.
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post #5 of 7 (permalink) Old 06-30-2005, 12:59 AM
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I would suspect the soil...


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post #6 of 7 (permalink) Old 06-30-2005, 02:47 AM
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6.5-6.7 is pretty optimal PH level iMO
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post #7 of 7 (permalink) Old 07-03-2005, 04:42 AM
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Am I correct your sig says DIY CO2 and you are NOT adding CO2???


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