pearling stops for a day or 2 after water changes - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 08-01-2016, 01:58 AM Thread Starter
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pearling stops for a day or 2 after water changes

Okay, so my plants usually do some moderate pearling in the last couple hours of the higher light phase of my tank (finnex 24/7). This is except for the days following a water change, which seems counter intuitive to what i have read about water changes and pearling. I just did a minor water change the other night, about 10% tank volume as opposed to the usual 30% to see if this still affected and it did, (ie, no pearling today). Its not a problem of course but seems odd, and if anyone could enlighten me I would appreciate it.

33 gallon fluval studio tank
Moderately planted
pressurized co2, with inline uv sterilizer modded to be used as a reactor, limits total co2 but i see a ph drop by 1 degree
fertilizers are added at water changes only, every 5-6 days( pinch of potassium phosphate, tsp of gh booster, and usually add 5-10 osmocote granuals into substrate monthly

Measured nitrate after last partial water change and read about 20-30 ppm, with uncalibrated api test kit, only thing that came to mind was reduced nitrate after water change but minor water change still affected pearling

Thanks in advance
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post #2 of 6 (permalink) Old 08-01-2016, 05:02 AM
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Do you have a hood or lid that you are removing to do the water change? This may be way off, but my thought is that those trap a higher concentration of CO2 causing the tank not to gas off quite as much. When you open the lid, your non-dissolved CO2 is released, and then it builds back up over a couple of days after water changes.

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post #3 of 6 (permalink) Old 08-01-2016, 05:08 AM
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How are you adding new water? When it's flowing out of a bucket, surface agitation is much stronger and it can degass your tank for some time. Not two days, but one for sure.


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post #4 of 6 (permalink) Old 08-01-2016, 05:17 AM Thread Starter
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thanks for replies guys, I do have a glass hood, but i slide it open daily for feeding. As for refilling it fills from a 1/4 tube into tank. Nothing else seems effected, i get growth during those non-pearling days and no algae issues, it just bugs me everytime and seems weird.
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post #5 of 6 (permalink) Old 08-01-2016, 05:24 PM
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Originally Posted by aquajester View Post
Okay, so my plants usually do some moderate pearling in the last couple hours of the higher light phase of my tank (finnex 24/7). This is except for the days following a water change, which seems counter intuitive to what i have read about water changes and pearling. I just did a minor water change the other night, about 10% tank volume as opposed to the usual 30% to see if this still affected and it did, (ie, no pearling today). Its not a problem of course but seems odd, and if anyone could enlighten me I would appreciate it.

33 gallon fluval studio tank
Moderately planted
pressurized co2, with inline uv sterilizer modded to be used as a reactor, limits total co2 but i see a ph drop by 1 degree
fertilizers are added at water changes only, every 5-6 days( pinch of potassium phosphate, tsp of gh booster, and usually add 5-10 osmocote granuals into substrate monthly

Measured nitrate after last partial water change and read about 20-30 ppm, with uncalibrated api test kit, only thing that came to mind was reduced nitrate after water change but minor water change still affected pearling

Thanks in advance
Hi aquajester,

It is likely that what is happening is when you do the water change you are removing some of a nutrient (or several nutrients) that the plants need for maximum growth and 'pearling'. Then over several days the nutrient is replenished and 'pearling' re-commences. It could be any nutrient, even nitrogen if the 20ppm-30ppm reading is taken prior to water changes.

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post #6 of 6 (permalink) Old 08-01-2016, 05:57 PM
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usually add 5-10 osmocote granuals into substrate monthly
Agree with Seattle_Aquarist , maybe it takes some time for the osmocote to leak the missing nutrients back into the aquarium water.

Alternative explanations could be the filter/pump is cleaned at water change and has increased flow during the first days. Increased flow might mean more degassing / displacing of saturated water from around the plant.

CO2 input could be low and it and takes some time to build to top/pearling concentrations.

I would go with the nutrients first though. Maybe try to add some EI solution after wc to see what you get. In the end, pearling is not always equal to happy plants. As you noticed you can get great growth without it.

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