carbon, iron, and the undissolving CO2 bubbles - The Planted Tank Forum
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post #1 of 20 (permalink) Old 01-27-2004, 02:45 AM Thread Starter
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i have two questions for you tonight:

Does carbon absorb the iron and other micronutrients that i am adding?

I have a AM1000 reactor hooked up to a Milwaukee reg running more bubbles than i could possibly count without a slow motion camera to get my co2 levels around 17ppm. However i hooked the reactor to the output of an eheim 2028 (277 gph) and there are still many many bubbles being expelled and an accumulation of co2 at the top of the horizontal tube. Should i hook up another reactor?
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post #2 of 20 (permalink) Old 01-27-2004, 02:47 AM
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Carbon will absorb iron and other trace minerals. Sounds like too much flow rate though the reactor. What size tank are we talking about here and what is the kH?
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post #3 of 20 (permalink) Old 01-27-2004, 03:06 AM Thread Starter
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the tank is a 125g and the kh is 40ppm (2.2)
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post #4 of 20 (permalink) Old 01-27-2004, 03:10 AM Thread Starter
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i tried using peat fibers a while back to lower the GH (150 ppm and lots of calcium buildup on equipment) so i took out the carbon, the tank smelled so bad that i could smell it from the next room. I like carbon but i guess if its gonna strip my tank of my plants' meals then ill try it again.
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post #5 of 20 (permalink) Old 01-27-2004, 12:52 PM
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If you tank smells find out what is causing the smell. Don't use carbon to remove the smell and ignore the cause.
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post #6 of 20 (permalink) Old 01-27-2004, 01:30 PM Thread Starter
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actually i think it was the peat (i used a lot). SO what your saying is that if I decrease the flow rate i will dissolve more bubbles? Im going to create a bypass if thats the case.
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post #7 of 20 (permalink) Old 01-27-2004, 04:32 PM
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What's your pH? If your kh is 2.2 and you're "...running more bubbles than I can count...", you really need to be careful. That low a kh and that much co2, you're asking for problems. Your buffering capacity is low at that kh, you could be really running a very acidic tank.
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post #8 of 20 (permalink) Old 01-27-2004, 06:30 PM Thread Starter
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the tap and tank ph is 7.0 without co2. With co2 it will run around 6.8 and if i run it for a while with ALOT of co2 it will drop to 6.6. I dont use any other buffer
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post #9 of 20 (permalink) Old 01-28-2004, 07:42 AM
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I am interested in this thread because in my 90G I use what I think is heaps of CO2 (one 2kg bottle in 11 days) just to keep my PH at 7.0. And my KH is 3.0.

So for anyone with any insights to these problems please let both of us know.

Paul
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post #10 of 20 (permalink) Old 01-28-2004, 12:31 PM
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rumples, you have a leak. No other explanation. Time to get the soapy water out and check all your connections and tubing.

alphozo, your reactor is either not hooked up correctly or the flow rate is really screwed up.
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post #11 of 20 (permalink) Old 01-28-2004, 02:38 PM Thread Starter
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ok i double checked the reactor and everything is hooked up good, now i made a bypass to cut the flow rate down and it doesnt shoot bubbles through the tubes anymore, however it doesnt have enough force to fully dissolve all the bubbles because they are accumulating into a large pocket of co2 at the top of the reactor. Im going to buy a valve to adjust the rate going into the reactor and if this doesnt work im all out of ideas. Do you think that a large pore filter like the blue first stage sponge in the eheims would stop these rogue bubbles? Maybe if i put it at the bottom of the reactor.
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post #12 of 20 (permalink) Old 01-28-2004, 04:15 PM
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not a bad idea to use the sponge. powerhead reactors (with the gravel tube attached) come with a coarse sponge to put in the bottom to keep debris out, and to increase CO2 exchange.

Bioballs also work real well at breaking up bubbles, and not reducing flow (like a sponge could)
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post #13 of 20 (permalink) Old 01-29-2004, 09:14 AM
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Hey Rex I will check for leaks, but my LFS says that a tank they have in the store, about the same size as mine, uses the same amount of CO2.

However, for the sake of thoroughness I will make a comprehensive check.

I am forever in your debt Obi-one

Paul
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post #14 of 20 (permalink) Old 01-29-2004, 12:11 PM
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A 5 lb bottle in 11 days means you have a leak. No if ands or buts about it. Either that or you have a non-existent reactor or one that is not working at all. Or you have so much surface movement that the tank looks like a bucket of boiling water.
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post #15 of 20 (permalink) Old 01-29-2004, 09:43 PM
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My 5lb bottle of CO2 lasts for almost 10 months. I would agree with Rex, Paul I think you have a leak.

Mike

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