Plants photosynthesis
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Old 08-04-2014, 01:27 PM   #1
GT3
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Plants photosynthesis


I set up my pico tank for a month now, in the past 3 weeks, plants have been producing oxygen in the way of columns of bubbles, I am able to see them 'photosynthesis' but coming up to just over a month now, i don't see it anymore, at least not a constant column of bubbles. They look healthy but no more bubbles producing. I wonder why, is it because of the nutrient deficiency below the soil? When I bought the soil it was Fluval strata substrate, so I guess the nutrients have used up, should I buy root tabs? I have been starting to dose Excel, Trace and Iron in my tank since last week, light is very strong. I place it near window (Yes I fully understand there will be more algae growing).



Tank:
1 Gallon
6 baby white cloud minnows
Fluval Strata
Plants

Equipment:
23W philips daylight

As you can see this is a very low maintenance tank, there is no filter, water is crystal clear. I can go and not change water at all. But I do it every week just so I can clean the algae on the glass. The most expensive thing is the glass bowl itself, cost me $12.99, hurts my wallet quite a bit. But anyhow I am just starting this, I plan on making a fully planted 'jungle' in this glass bowl.
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Old 08-04-2014, 01:43 PM   #2
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The bubbles stopped because the oxygen level in the tank water is lower than what it used to be. It doesnt mean photosynthesis has stopped. I bet you see it mostly on water change days now, right? That is due to high O2 levels from the new water + agitation.

Cool little set-up btw.
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Old 08-04-2014, 04:36 PM   #3
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You mean CO2 or O2?? the bubbles are supposed to be oxygen coming out from plants through intake of CO2. Did you mean when there is less CO2, there is also less bubbles releasing?
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Old 08-04-2014, 04:55 PM   #4
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Pearling happens when plants are releasing oxygen faster than it can be absorbed into the water. When the water is saturated with oxygen, it allows the oxygen released by plants to be seen as bubbles to the naked eye. Low oxygen levels in the tank = no pearling bubbles, because the oxygen released by plants is being absorbed. That is a broad generalization. There are other factors in play, but in a low tech bowl it's going to have more to do with the oxygen content of the water than anything.
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Old 08-04-2014, 05:55 PM   #5
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I agree. Pearling is not a sign of plant health, only of water O2 saturation. Colder water absorbs more O2 and can reduce pearling. Lots of factors affect pearling.
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Old 08-05-2014, 07:16 PM   #6
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Quote:
Originally Posted by burr740 View Post
Pearling happens when plants are releasing oxygen faster than it can be absorbed into the water. When the water is saturated with oxygen, it allows the oxygen released by plants to be seen as bubbles to the naked eye. Low oxygen levels in the tank = no pearling bubbles, because the oxygen released by plants is being absorbed. That is a broad generalization. There are other factors in play, but in a low tech bowl it's going to have more to do with the oxygen content of the water than anything.
Thanks, yes pearling only happens when I do water changes now. So since it is due to low oxygen level, should i be concern about it, maybe add a air stone? Right now there is no pearling at all! But as suppose to before, I didn't do water changes, it had a lot of pearling when I first started the tank, ever since I overdose Excel pearling stopped, until I do water change.
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Old 08-05-2014, 10:39 PM   #7
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Do not add an airstone. It will agitate out the CO2 in the water like shaking a soda removes the fizz. Then plants will grow slower as they will have less CO2 to use.

Again, pearling is NOT a direct sign of good plant health. It is a reflection of a dozen water parameters that do not affect plant growth very much.

If you want to see pearling again then buy a pressurized CO2 system so the plant's metabolism increases and they make more O2, raise the water temperature to 82 F to increase metabolism and decrease the capacity of your water to hold oxygen and finally ensure that the plants do not get nutrient deficiencies or this will reduce growth rate and the amount of new tissue that can produce oxygen.

Excel can act as a toxin when too much is dosed. Certain plants are more sensitive than others. This may reduce the rate of oxygen production.
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Old 08-06-2014, 12:35 AM   #8
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Is root tab recommend to use?
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Old 08-06-2014, 03:32 AM   #9
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You can use a root tab in your tank.
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