Does abruptly stopping co2 dosing typically shock plants so that algae bloom occurs - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 02-17-2014, 04:09 AM Thread Starter
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Does abruptly stopping co2 dosing typically shock plants so that algae bloom occurs

Does abruptly stopping co2 dosing typically shock plants so that an algae bloom occurs, keeping in mind, the tank had algae issues before the co2 better stabilized things? Would the plants need to be weaned off the co2 to avoid shocking them and causing an algae bloom, is that possible?

Or, just cause I have more than enough light to keep using co2, even though I don't want to, is it likely that the algae bloom will come back anyway, even if I do wean the plants off the co2 slowly, and if that is likely, why? I would think it not possible because the extra light is wasted when enough co2 is not present (those parameters are directly dependent on each other, right?)

Or, finally, can one just stop dosing co2 without worrying about shocking plants and the return of algae blooms?

I'm specifically concerned with hair algae that tried to take over my rotala walichii.

Last edited by mef1975; 02-17-2014 at 04:24 AM. Reason: .
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post #2 of 3 (permalink) Old 02-17-2014, 04:15 AM
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Hi mef1975,

I would suspect that the lack of CO2 slowed down the photosynthesis of the plants. This in turn slowed down the uptake of nitrates and ammonia, phosphates, etc resulting in excess nutrients and the algae bloom. Weaning off the CO2 would not make any difference. Reducing the nutrients (fish waste, uneaten food, plant ferts, increased water changes) and reducing the photoperiod should help stabilize things.

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post #3 of 3 (permalink) Old 02-17-2014, 05:11 AM
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Plants adapt their internal chemistry to best deal with the water parameters they live in. When you abruptly change the amount of CO2 available to them, they are unable to continue to live the good life until they get their chemistry back in synch with the new conditions. Anything that causes the plants to be less healthy, which this would do, will also encourage algae to move in. This might be why allowing the concentration of CO2 in the water to vary significantly from day to day usually encourages BBA to take over the tank.

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