Co2, pH, and low tech
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Old 04-29-2015, 09:19 PM   #1
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Co2, pH, and low tech

In a no supplemental co2 setup, would having the pH rising to 8ish + when my tap water has a pH of 7.5 indicate that co2 is a limiting factor? I know co2 injection lowers pH, so I'm wondering if the reverse is true and not having enough would raise the pH.

Also I had a horrific infestation of BBA(I'm assuming). I have read from Tom Barr that this is caused by unstable co2 levels.

I was already doing almost no water changes as I read this is bad for low tech. My tank is also completely covered except for holes for equipment. This is a necessity because I have cats. I am wondering if this would prevent adequate gas exchange with the atmosphere to replenish co2.

I'm just theorizing, any help or someone to set me straight would be appreciated as I am struggling with my tank. Thank you for all help.
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Old 04-29-2015, 09:28 PM   #2
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ph rising from the tap is relatively normal, usually there is some atmospheric co2 disolved in the water since it's under pressure in the pipes it can hold more than when not under pressure. It off gases after a water change and causes the php to change (this is usually within a 24 hour period changes in php over a long period might indicate other issues). This is why a lot of people prepare their water change water in advance, and have some form of mixing going on, gives the dechlor a chance to work, evens out temp differences, and lets php stabilize

as to the other questions I'm not sure
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Old 04-29-2015, 09:42 PM   #3
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Default CO2, pH and Low Tech

Hello I like...

Unless you keep rare fish species, you don't need to worry about the chemistry of your tap water. The vast majority of fish you get at the fish store will adapt to the vast majority of public water supplies. You just need to use a treatment to remove chlorine and the chloramines the public water people put into the tap water to make it safe to drink. A pH of 6.5 to 8.5 is very tolerable for most aquarium fish.

Algae is controlled by using floating plants. Anacharis is about the best. Get this plant started and your algae problems will be minimal at best. This plant gives off a mild toxin that most kinds of algae don't tolerate.

Water changes are critical to the health of your tank. The more water goes the filter, the less it's able to support life. So, work up to the point you're removing and replacing at least half of it weekly, no slacking.

Your filtration equipment should have a gallon per hour (gph) rating of at least 4 times the volume of the tank in gallons. More isn't better, it's just more. Keep the water clear of dissolved wastes and you'll have few, if any tank problems.

Have fun!

"Fear not my child, just change the tank water."
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Old 04-29-2015, 10:45 PM   #4
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What lighting do you have? You can't use high light for a non-CO2 tank, or you get the same experience you have.
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Old 04-30-2015, 12:42 AM   #5
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Hi hoppy. you replied in my other thread I made about my lights actually. I have 2 single bulb fixtures solarmaxhe lights. .They are t5 normal output, on a 40 gallon breeder.

The no water changes came from what I read from Tom barr and some others. Says that for a no co2 tank if you change the water you introduce unstable co2 levels. That's why I was not doing water changes.

When I mention the pH rising, it wasn't after a water change. I had gotten that reading multiple times.

I have a strong filter, eheim canister, forget the model atm. 2217 I believe.

I do use a decholorinator.
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