Blackout with co2 running? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 08-22-2010, 09:26 AM Thread Starter
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Question Blackout with co2 running?

I was wondering if i can do a blackout but keep the co2 running?

I would like to keep the co2 going because the tank has crystal shrimp in it and the co2 keeps the PH at 6.9-7.0

If i have to keep the co2 during a blackout will the PH raise too much for the shrimp

also i want to do a blackout because i have 3 types of algae
-Blue Green Algae, BGA
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post #2 of 5 (permalink) Old 08-22-2010, 09:57 AM
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Well unless you have a filter or air bubbler going on, I think it would be okay. Cuz during the black out the plants will hardly if not at all be doing photosynthesis and will not be contributing and oxygen or using the CO2, I believe.
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post #3 of 5 (permalink) Old 08-22-2010, 10:47 AM
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Sounds like you may have poor water circulation in your tank. All 3 of these can be caused by this one factor. Check out this algae guide, It has helped me out quite a bit pinpointing where the source of the problem is.

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post #4 of 5 (permalink) Old 08-22-2010, 11:00 AM Thread Starter
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that guide is my bible lol

from reading that i thought my flow might be my problem but my tank is only 17g and i have a 2215 running

could dosing be my problem aswell? cause i have no idea about ferts im using the seachem range N,P,K iron and trace and just following the bottles cause i have no idea lol
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post #5 of 5 (permalink) Old 08-22-2010, 01:29 PM
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it could definately be a problem. i dont know how heavlily your tank is planted but if you have co2 and a good amount of light it wouldnt take long at all before your tank uses up all the nutrients. you bottom out and you'll have an algae problem for sure.

if you do do a blackout without your turning off the co2, here is whats going to happen. your plants wont use the co2 that you are putting in there so your water will build up more co2(unless you are using a ph controller) and the ph will drop lower than what you have it set at now. on top of that your plants let out co2 at night. so unless you have a controller, your ph will change anyway. on top of that i'm not sure that the ph, when altered by co2, is effective at changing the ph in a proper way. what they are more sensitive to is tds (which has a direct effect on ph). if you have water with tds that cause your water to be at the ph of 8 and you lower the ph with co2, you arent changing the tds at all.

i'm no shrimp pro though so check over at the invert section. msnikkistar or mordalphus should be able to help you on that
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