|General Freshwater Discussion For all topics relating to freshwater fish to the in's and out's of maintaining a freshwater tank.|
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|08-30-2019, 02:24 PM||#1|
Join Date: Aug 2019
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Matching pH during water changes - best method is (not) a chemical?
If the tank your running is at a higher pH than your local water supply (ie. tap water)... what is the best way to replace the water during a WC so that the pH remains stable? For my example, lets say the tank is 7.6, and the local water supply is 6.6 pH.
If I'm running a tank that has crushed coral or limestone inside it, my understanding is that over many weeks these substances slowly leech into the water creating a natural stable pH. The water being replaced after a WC/vacuuming doesn't have the luxury of being slowly tweaked by coral or dissolved anything... so I'm supposed to use a pH riser chemicle like pH Up to try and match it before dumping it in the tank?
Lets say this *is* the preferred method of matching pH... doesn't the pH boosted replacement water crash after a bit of time or is that not a worry?
pH booster (like API pH up) or baking soda... either way - how does that water now react with the water that was left in the tank which was naturally raised via coral/limestone?
When talking regular WC, I'm thinking 15% - 25% weekly. Water is also treated with conditioner like Prime.
|08-30-2019, 02:43 PM||#2|
Join Date: Jul 2009
Location: don mills
Feedback Score: (80)
my recc is to stop chasing the numbers take a step back go back to basics
stop adding things to tank to correct this and that .
jmho…. adding additives to tanks is band aids most can be controlled thru water changes ...sometimes adding stuff just makes a bigger mess and u cant correct the issue created .
90 gallon reef ready tank ...
hippo tang , yellow tang, 1 damsel ,flame hawk (favorite ),watchman goby ,harlequin star fish (hides boring ) bi -color blenny,cleaner wrasse , bengai cardinal,twin spot goby, mandarin .
sand sifting star fish ,
elusive marine betta(MIA - shows him self periodically -boring )
in progress TBA.....project tranquility ............
90 gallon dual drilled tank with sump
2 - evergrow leds ,dual t5 48" aquatic life fixture
|09-06-2019, 04:41 PM||#3|
Join Date: May 2019
Feedback Score: (0)
Ph is measured on a logarithmic scale, so a normal water change shouldn't really affect it that much.
Have you actually measured it before and after changing the water?
It's been a long time since I've done the actual math, but if i remember correctly, if you replace 1/2 of the water with ph that is 1 point lower, it shouldn't go down more than 1/4....
|09-12-2019, 03:23 AM||#4|
Join Date: Dec 2010
Location: Markham, ON
Feedback Score: (7)
I don't know how to solve the issue on hand, but if you want the math...
If you change 50% of the water with a ph of 6.6 water and 7.6 (tank water)
Your new ph will be 6.86
If you do a 25% water change with a ph of 6.6 water and 7.6 (tank water)
Your new ph will be 7.09
10% Water change would result in a ph of 7.32
What should also be considered is how long the crushed coral takes affect on the ph.
A helpful link that might shine light on your later questions might be here, but it is a bit wordy...
The link also explains why it's suggested to avoid additives when possible
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