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Author Topic: High light plants direct sunlight  (Read 2305 times)
Ruthy
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« on: October 08, 2015, 05:37:00 AM »

Hi all,
My low light plants haven't been doing too well because they've been getting too much light being by window (flatmate put them there), so currently tank is covered with towels... Just wondering if high light oxygenators would grow without a bulb overhead if on the side of the tank with the most sunlight? Or would it just not work?
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essabee
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« Reply #1 on: October 08, 2015, 08:06:46 AM »

Allowing direct sunlight from the side will only cause algae to form on the glass and filter out the sunlight from the plants.

I have grown high, medium, and low light demanding plants in direct sunlight from the top (4 hours direct and rest indirect) without algae. It only requires a densely planted aquarium where the CO2, and other nutrients are non-limiting to the plant growth.
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Ruthy
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« Reply #2 on: October 08, 2015, 08:38:45 AM »

But if the glass was scraped regularly (minimum twice a week) would that still inhibit growth?
I'm not great with plants haha
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TwoTankAmin
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« Reply #3 on: October 08, 2015, 11:14:47 AM »

The bigger issue can be how the plants grow. They always try to orient themselves toward the source of the light. When the light is coming from above, the plants grow up as we normally expect. However, when the source of the light is from the side, this will change the way they try to grow. One solution is a black background (or other light blocking material) used on the sides of the tank as well as the back will block light from coming in this way and limit it to the top.
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russ
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« Reply #4 on: October 08, 2015, 04:55:14 PM »

I've also got t-shirts for the black backing, but I have to ask about your TDS. If they are in a wilting stage, they may be dehydrating.
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Ruthy
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« Reply #5 on: October 08, 2015, 04:57:59 PM »

Have no test kit here Sad . Waiting on a friend to lend me hers so no idea at the moment on the water quality
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russ
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« Reply #6 on: October 08, 2015, 06:25:54 PM »

Ruthy, does your school lab have a TDS meter?
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Ruthy
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« Reply #7 on: October 08, 2015, 07:06:26 PM »

No Sad . I'll nip to the shop tomorrow and pick up a cheap kit
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essabee
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« Reply #8 on: October 08, 2015, 07:33:55 PM »

Even if you block out the sides and get the sun from the top - you will have a tank where the light will be very strong. You will then need to supply your plants with CO2, macro nutrients and micro nutrients at levels where their lack does not limit plant growth. If you fail to appease your plants requirement you will have a disastrous algae attack.

I have a tank which gets 4 hours direct sunlight in the morning and strong indirect sunlight for rest of the the day - only from the top. I supply the tank with massive dosage of nutrients and CO2 to keep the algae at bay.

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Ruthy
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« Reply #9 on: October 09, 2015, 02:50:13 AM »

Ah that makes sense. Will rearrange the room and put tank where I origionally had it
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Ruthy
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« Reply #10 on: October 09, 2015, 09:06:23 AM »

Got a strip test kit (okay I know not accurate but don't have £35 going spare)
GH 0-30 (Edinburgh has very soft water so this isn't new)
KH 0-40
pH maybe around 6.5, hard to tell... But neutral-acidic
NO2- 0
NO3- 0 (suuuure it is, shouldn't be high though anyway with twice weekly water changes and 8 fish..)

Tank now moved to opposite corner so away from window and not in direction the sun tends to directly come through
Sorry about the crummy pictures, am in a bit of a rush as need to be heading to Newcastle soon!


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