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From: Thomas Barr <tcbiii at earthlink_net>
Subject: Re: Marl
>Sounds like marl. Your tank is CO2 limited.
>DIY yeast CO2,you are CO2 limited.
I know the best solution would be a canister CO2 system, but I just can't
afford that right now. It is the first thing on list of big stuff to buy for
that tank, but gotta get my husband working again first! Is there a way to
get more of the CO2 being produced by the yeast bottles (they bubble away
into the tank pretty strongly, but I guess most of it is being gassed out?)
into the water?
>A few of these will produce marl, the vals in particular. This can get
>tossed around all over everything. Marl is carbonate deposits/encrustation.
>Your plants are using the hard water(KH => HCO3--> CO2 + OH) to get at the
>CO2. That leaves the OH- left which raises the pH. At the surface of the
>leaf, the amount of OH's can get pretty high, enough to precipitate out
>carbonates if the plant is growing fast. Chara, Potamogeton and vals tend
>particularly good at production of marl. This process can remove KH to the
>point of making things unstable if you do not do many regular water
We do have fairly hard water here. But the KH in all the tanks stays quite
>Like I said , CO2 limited. BTW, O.00ppm NO3 and PO4 are not good. Shoot for
>5-10ppm of NO3 and .4-5.ppm of PO4 and a CO2 level of 20ppm-30ppm.
I had cut back on the amount of nitrate of soda I had been adding to the
tank, because I was afraid that was possibly causing the problem. I'll bump
it back up again. How do I get the PO4 up?
Thanks for the help!
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