High light, non-co2, floating plants = no algae blooms? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 01-09-2008, 04:03 AM Thread Starter
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High light, non-co2, floating plants = no algae blooms?

I was thinking how usually high lights (defined as higher than 3wpg) without adequate CO2 will result in an imbalance in the tank, causing algae blooms.

To counter this without reducing the light levels, is it possible to have floating plants curb algae blooms in a high-light non-co2 tank by absorbing and diffusing most of the light?

The floating plants will draw CO2 mainly from the air, and nutrients from the water column.

The submersed plants will receive less lighting due to floating plants shading and diffusing the light. The submersed plants will have growth typical to low light, non-co2 systems.

Fertilizers will be dosed according to a low light, non-co2 tank EI schedule.





I am planning on experimenting with this idea, but before I go through with this, does anyone have any input/suggestions?


I will use cardamine lyrata and duckweed in a 55 gallon tank with 3wpg (2x 55w PC, 2x T5 NO 28w). Cardamine is slightly submersed but should block lots of light. Duckweed will block a lot of light.
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post #2 of 6 (permalink) Old 01-09-2008, 11:19 AM
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The shading to the other plants probably won't be very even with floaters. What you propose is almost the same result as merely running less light (minus the potential nutrient harvesting). However, if you're dosing ferts, harvesting the floaters is also a step backwards.

I'd say if that is the look you are aiming for, fine. You know it result in less light to others in the tank. If you are going with the floaters solely to offset the issues, you'd be better off disconnecting some of the lighting in your hood.

fwiw, I had a 175 watt MH over a 20g high (reef) for 10+ years. It was a bit of work managing the macros to keep the light and nutrients appropriate!! I think you'll be harvesting lots of floaters and dosing more nutrients than needed just to offset your lights.
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post #3 of 6 (permalink) Old 01-09-2008, 04:56 PM
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I agree. I run a high light tank (2x24W T5HO over a 4.4 gallon tank) w/floaters on the surface and pressurized co2 and if you don't have enough stem plants, the tank will grow algae instead. I notice that when I trim my stem plants, the tank will unbalance itself slightly until the stem plants start filling in again.

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post #4 of 6 (permalink) Old 01-10-2008, 02:26 AM
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I don't know enough to be of service but it sounds like really interesting experiment. I think it should look great too. Can't wait to see it in action
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post #5 of 6 (permalink) Old 01-10-2008, 03:44 AM
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You're actually going to PUT duckweed in there? I still can't get rid of it. I hate duckweed.

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post #6 of 6 (permalink) Old 01-10-2008, 05:26 AM
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If you do this use Frogbit or other large floaters. Duckweed is kind if weird looking as a cover. Been there.

Problem is this plan will (long term) limit most anything you grows below.

Plants that don't get enough light will tend to stretch out or not grow well at all.

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