need help and advice for very soft tap water and pressurized co2 - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 11-26-2011, 11:43 PM Thread Starter
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need help and advice for very soft tap water and pressurized co2

I'm a little concerned about my tap water and potential problems down the road when I begin injecting co2.

water out of tap
pH 7.6+
GH 2
KH 1

water in tank with aquasoil 'new' amazonia
ph 6.4
GH 2
KH >1 (turns bright yellow faster than tap)

tank specs
29g
aquasoil 'new' amazonia
78F temp
2x24w t5ho w/ dual reflectors
eheim 2217 w/ 1l mech media and 3l bio media

I'm using API test kit for all the above numbers. The pH has actually been surprisingly stable in the tank with aquasoil even with the low KH. My tank is currently on day 5 cycling w/ aquasoil and ph has been stable since day 2. I've been following 'shrimp farm' aquasoil cycling guide and the only time the ph changes is immediately after a 50-75% water change. It goes up to around 6.7 ph and drops back down to 6.4 after a few hours.

Waiting on co2 regulator, but I'm planning on beginning pressurized co2 sometime next week. I plan on keeping cardinals, otos, and amanos/crs in this tank eventually. Also will have crypt wendtii, crypt baelansae, and marsilea minuta. Am I going to run into buffering problems later down the road when I begin injecting co2? Should I look into some sort of buffer? I would prefer not to mess with any kind of buffers if possible, but will do it if it's necessary. Thanks in advance!
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post #2 of 8 (permalink) Old 11-28-2011, 12:33 PM Thread Starter
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any takers? bueller? ;(
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post #3 of 8 (permalink) Old 11-28-2011, 01:01 PM
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I don't buffer the KH but do add GH booster once a week with EI dosing and CO2 injection... my malawa, cherries, amanos, and fish are all doing well.

I am not blasting the tank with CO2 though, enough to keep it lime green, and medium light.
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post #4 of 8 (permalink) Old 11-28-2011, 07:05 PM
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your water is perfect for the plants, you just need to add Ca and Mg in your tank once a week during water changes.

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post #5 of 8 (permalink) Old 11-29-2011, 01:37 PM
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too much light for a new tank, cut it to half, wait until all plants to settle in and start growing, then increase the light if needed, and CO2 too.
get a copy of water report from your local DEP to see how much Ca and Mg are in the water, you may already have enough in the water. we have <1 GH and <KH in our magical NYC tap water, and I only add small amount of Ca and Mg to increase GH by 1 degree.
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post #6 of 8 (permalink) Old 11-30-2011, 10:25 AM Thread Starter
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Thanks for all the advice. I found a water report online for my county, but didn't see Ca/Mg on it so I'll prob end up calling them today about it. maybe i have magic water tap water too?!? ;p

http://www.fultoncountyga.gov/images...2011CCRWeb.pdf

unfortunately, the lights won't run w/ just 1 bulb. guess they are wired together in a circuit. i'm going to go to home depot this afternoon and get a screen to put under the lights to reduce output in the meantime. not sure how much this affects hoppy's light intensity formula, but its a 24" bulb over 30" of tank so the two ends are lower light than the middle. probably doesn't change anything?

thanks, btw, the MM is still doing great. saw a few new shoots this morning!
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post #7 of 8 (permalink) Old 11-30-2011, 07:46 PM
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your local water report doesn't really give you any information on what's in the water. the alternative is if you have any Ca test kit, you can then measure how many ppm of Ca in the water, then derive the Mg concentration. or try to post in your local section of the forum to see if anyone locally to you has this information.
as for the light, if you have the ability to raise the light fixture, that will reduce the intensity too.
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post #8 of 8 (permalink) Old 12-15-2011, 04:01 AM
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I have just started using pressurized co2 and I have found that water with low kh and low gh will be low ph , my rain water is ph 6.4 kh 0-1 but you cant dosolve much co2 with out the ph droping you want a kh of at least 3-5 this will raise your waters ph to about 7.2 but once you get about 15 20 ppm co2 in the water the ph will be back to about 6.8 so co2 is only dangerous when there is no buffer and the make up of the buffer has stuff in it that your fish need to live a long life
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