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post #1 of 3 (permalink) Old 02-02-2006, 11:57 AM Thread Starter
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Need a little help

I waited late to check my pH to see how much it drops. Here is my information. All tests were run twice (pH 3 times) to make sure.

Tank = 29 g
Light = ~90 watts (been off for 6 hours before tests)
CO2 = DIY range 1-3 bps. Runs through filter intake. No bubbles seen from return

Tests
pH = 5.5 (has been ~6.5 during light hours)
GH= 3
KH= 4
NO2= <0.3 mg/l
NH3/4= n/a

Misc. Info = 10% water change 32 hours ago.
I am not adding any fertilizers or supplements to my tank yet.
I have added Epsom Salts and Baking Soda to get the current GH/KH


Here is the deal. I have $40 in starter plants arriving today and I want things right. I would also like to start adding to my fish stock this weekend, but not with a pH of 5.5 and the drop from 6.5 daily.


Is it possible I have an excess of CO2 for the few plants I have now? Could I see a pH increase after fully stocking the tank with plants?

I know I can raise the GH/KH more, but is it OK to keep adding baking soda and Epsom salts?

My target is to maintain a pH between 6.5 and 7. Any advice?
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post #2 of 3 (permalink) Old 02-02-2006, 12:50 PM
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I may be wrong, but I think in order to attempt to calculate the co2 content in the aquarium we need your tap water's KH value, not the KH after buffers are added.
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Originally Posted by Keck
Is it possible I have an excess of CO2 for the few plants I have now?
Within reason, No.
Quote:
Originally Posted by Keck
Could I see a pH increase after fully stocking the tank with plants?
I'd say you would definitely see an increase as the plants use up carbon. BUT this depends on lighting and other fert levels.
Quote:
Originally Posted by Keck
I know I can raise the GH/KH more, but is it OK to keep adding baking soda and Epsom salts?
It's not a problem, but I don't see why they need to be any higher.
Quote:
Originally Posted by Keck
My target is to maintain a pH between 6.5 and 7. Any advice?
Here's how I see it: You want about 30 ppm co2, right? And you want this to be as stable as possible, but that's hard with DIY. So it sounds like you want to adjust the amount of buffer used, based on the amount of co2 being injected, to hit a pH of 6.5/7?

I'd say: choose an amount of buffer that will get you close to what you want, then keep it steady at that. Fish can handle small pH swings (from the ph/co2), but they might not appreciate varying levels of hardness.
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post #3 of 3 (permalink) Old 02-02-2006, 01:25 PM Thread Starter
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KH is 5 a few hours out of the tap, but slowly drops to 3 without buffer.
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