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can you give too much co2 plant only tank

1253 Views 10 Replies 10 Participants Last post by  MarkTheShark
Well we recently had a bit of a well water disaster, basically all livestock were lost. We never found out what it was but now that for the time being I have a plant only tank can I really increase my co2 to really high levels, What i mean is how much should i be aiming for full plant use only. I know with livestock people try to never exceed 30 ppm because of livestock. but without livestock what will the plants use
Tank parameters.

135 gallon
480 watts CF lighting
pressurized co2 with ph controller
ph out of tap 7.2
kh 120

thanks in advance
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plants seem to do best at 30ppms, I dont think anymore would benefit them. not sure though, don't take my word for it...
Without livestock, you can crank up CO2 as high as you like without hurting the plants. Just remember that your growth rates will still be limited by the lowest available nutrient. (Lighting, ferts, CO2)
Just remember that your growth rates will still be limited by the lowest available nutrient. (Lighting, ferts, CO2)
In the custom gaming computer world, a situation like this would be deemed "bottlenecking" or being "bottlenecked" lol
Usually my tanks run between 15 and 40 ppm CO2 w/o problems.
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Couldn't running your CO2 too high lead to a pH drop that could kill your plants? Assuming you're not buffering your pH with your substrate or crushed coral or something? (Soft water here...)
Couldn't running your CO2 too high lead to a pH drop that could kill your plants? Assuming you're not buffering your pH with your substrate or crushed coral or something? (Soft water here...)
no the drop in ph associated with injecting co2 will not hurt plants or animals what does hurt them (animals) is the lack of o2 that comes with water that is too saturated with co2.
I didnt think co2 concentration effected o2 significantly? Of course insuficient O2 by any means will harm fish, but you dont have any. However with 480W over a 135g I say youll probably need all the co2 you can get ;).
CO2 and O2 concentrations are NOT related. You can supersaturate O2 and if you have saturated CO2 concentrations, your fish will still die due to not being able to respire their CO2 out of their system. The pH drop is not the primary issue, they die from the equivalent of suffocation before low pH effects them.
Arakkis,

Yes, o2 is definatly needed. A good substrate that is porous helps alot. During the day there shouldn't be a problem, but at night the roots seek o2 that is trapped in the substrate.
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