Tropica soil PH buffering

Sammy Islam

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Hello everyone I have just set up a new scape using tropica soil and understand that it buffers my PH which it is doing. My tap water is about 21/22gh 12/13kh PH 7.3 (Degassed PH7.9). My tank water is currently PH 6.7/8 which i assume is because of the soil.

+ How long will the soil (27L) buffer my water for until its exhausted?

Here a link to the journal i've started:
https://www.ukaps.org/forum/threads/channelling-my-inner-felipe-as900.59565/

I'm asking this as i was going to use a PH pen to dial in my co2 but i'm guessing i can't until the soil no longer buffers my water? And have to rely on lime/yellow drop checker?

I know my co2 is good because i just took it off my old tank and replaced the diffuser with a large neo diffuser instead of a medium and my drop checker was light lime green in the opposite side of the tank near the substrate during yesterdays photo period.

My old tank is nearly 3 years old with not a lot of soil so nothing gets buffered, so my PH is my degassed tap water value at PH7.9 and during my co2 period it would be 6.8/9 and was measurable with my ph pen achieving the "1 point drop"

But if my new tank is being buffered to PH6.7 i can't measure the 1point PH drop as i doubt my ph can drop any lower than 6ish with a high KH even though i've got good co2?

Thanks
 
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Zeus.

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How long will the soil (27L) buffer my water for until its exhausted?

depends on the hardness of your water it can become exhaust in hard water as the abundance of ions blocks the CEC sites on the AS. I used ADA AS and have hard to Very hard water and I recon it lasted about a year.
With softer water the abundance of H+ ions helps free up the CEC sites on the AS.

With your water you might need to consider using Fe DTPA or FE EDDHA when the buffering is exhausted as I did ;)
 

Sammy Islam

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Thanks, i'll keep an eye on it see if it changes over time. So does that mean i can't achieve a "1 point drop" reading with a ph pen even though i would have that drop if the ph wasn't being bufferd by the soil? If that makes sense.....

@Zeus. I used EI dosing on my old tank with DTPA iron mixed in and seemed to do well so hopefully works this time. I have made up 2x 3L batches of both macro and micro solution, do i need to add any excel/easy carbo to either to prevent any moulding?

Thanks
 

Zeus.

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Thanks, i'll keep an eye on it see if it changes over time. So does that mean i can't achieve a "1 point drop" reading with a ph pen even though i would have that drop if the ph wasn't being bufferd by the soil? If that makes sense.....

The 1.0 pH drop is is pre CO2 on till lights on - best if stable but the DC colour change is a great guide once it catches up with the [CO2]

I have made up 2x 3L batches of both macro and micro solution, do i need to add any excel/easy carbo to either to prevent any moulding?

No thats for Liquid Carbon which can be used as well as CO2 injection esp in the early days. For mould prevention in ferts Absorbic Acid 1.0gram per litre and Potassium Sorbate 0.4 grams per litre is the general recommended dose of many folk- I might just put a 'tad' more in :angelic: esp if doing big batches best stored in dark cool place or even a fridge and just get out what you need for a couple of weeks helps too.
 

Sammy Islam

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Cool so you make up big batches of EI and then only use a month worth at a time? So i cant can't make a big batch and use my autodoser like i would with my old tank? I only use to make 1L at a time. So if i i wanted to make 5L of each solution i would need to add about 5g absorbic acid and 2.5g potassium sorbate to each solution so stop it going mouldy?

Thanks
 

Sammy Islam

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Cool thanks, makes sense :thumbup:

@Zeus. For the 3L i've made up can i just store it in a cold dark place without adding the absorbic acid and potassium sorbate?
Well I'll have 2L of each to store if i use 1L at a time.
 
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Sammy Islam

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Now i have my first tank inhabitants i've been thinking.... If my water is being buffered to about ph6.7 and my tap water is 7.3 (7.9 degassed), when doing large water changes (usually 70/80%) will the ph change effect my fish and shrimp? Or will the soil pretty much buffer it straight away?
 

Zeus.

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Now i have my first tank inhabitants i've been thinking.... If my water is being buffered to about ph6.7 and my tap water is 7.3 (7.9 degassed), when doing large water changes (usually 70/80%) will the ph change effect my fish and shrimp? Or will the soil pretty much buffer it straight away?

With a large WC there will also be a pH drop as the water you have added will have lots of dissolved gases which will reduce the pH, always get lots of pearling after a WC as water degases. But the AS will buffer it also dependant on the waters pH- if the waters pH is high it will lower the pH and visa versa. Your Fish and scrimp cope with the pH swing every day with your injected CO2 so for them IMO its just another pH swing in their daily life as an inmate of your tank;)
 

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