Dosing Before or After the CO2 is Turned on? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 08-09-2019, 09:16 AM Thread Starter
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Dosing Before or After the CO2 is Turned on?

Hey All

Title says it all. So I run a 80L low tech tank with a DIY CO2 system. In the morning when I come in to switch the CO2 on I notice my plants look quite pale and washed out. Its also at this point I would normally dose my plants too. 8 hours later when I come back to switch the CO2 off for the evening I notice a drastic change in their colouration which has got me thinking that I should dose after the lights turn off for the day.

Now I should say I've been running a diluted dosing regime where i take the recommended weekly dose (as per back of the bottle) and mix it with 700ml of tap water and divide that out over a 7 day period. Since Its a DIY CO2 system that turns on when I turn it on and not before the lights come on (normally an hour after).
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post #2 of 5 (permalink) Old 08-09-2019, 12:32 PM
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I always dose before lights and co2 coming on. Just my habit I don't know of any empirical evidence that suggests one way is better than another. Once you dose the nutrients are in the water for the plants to uptake when they want.
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post #3 of 5 (permalink) Old 08-09-2019, 11:50 PM Thread Starter
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Quote:
Originally Posted by Frank158 View Post
I always dose before lights and co2 coming on. Just my habit I don't know of any empirical evidence that suggests one way is better than another. Once you dose the nutrients are in the water for the plants to uptake when they want.
Yeah the more I thought about the idea the less it seemed to make sense. I decided to switch to a larger dose as bigger intervals so there's more nutrients waiting for the plants. Honestly it was just that observation of the pale plants in the morning and the greener plants in the evenings that got me thinking. I'm thinking now maybe that difference is due to the time it takes for the plants to uptake the available resources.

Anyways I guess I'll keep watching and trailing different ideas
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post #4 of 5 (permalink) Old 08-10-2019, 01:35 PM
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I'm pretty much in the same lane as @Frank158.

Only I don't dose before the photoperiod - I typically just dose when I remember to do so. Almost never at the same time each day. It would obviously be better if I had a fixed routine or calendar reminder because that would make me less likely to forget.


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post #5 of 5 (permalink) Old 08-10-2019, 03:05 PM
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If the plants are actually running out of available fertilizers then I think it would be better to ramp up dosing so that by dosing you are adding to the gas tank before it hits empty. In that case time of day shouldn’t make any difference. Even every second day, should be fine, assuming the extra amount of fertilizer concentration isn’t causing problems with your fish.


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