Distance between gravel and light - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 07-05-2010, 08:48 PM Thread Starter
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Distance between gravel and light

Hi everybody,

like you know i am planning to setup two tanks (150x45x45)(100x45x45), but i am not sure about the height of the two tanks.

the reason for that is that i don't know what is the best distance between the gravel and the light, so if there is a role to calculate this distance please help me with it, and if there are any other things please let me know

by the way i am using 4 (2 aqua flora+2 midday) Giesemann T5 80w each for the 150 tank, and 4 (2 aqua flora+2 midday) Giesemann T5 39w each for the 100 tank.

your comments well be very helpful for me
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post #2 of 6 (permalink) Old 07-05-2010, 09:56 PM
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Remember the amount of light intensity sets the amount of co2 and ferts you will need to dose. Less is much better fro beginners.

Good thread on par data and distances:
https://www.plantedtank.net/forums/li...5ho-light.html


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post #3 of 6 (permalink) Old 07-05-2010, 10:30 PM
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hoppy is the light man. shoot him a pm if he doesnt respond to your thread first
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post #4 of 6 (permalink) Old 07-06-2010, 12:56 AM
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I wouldn't even consider more than two T5HO bulbs over each of those tanks. The 45 cm (18 inch) front to back depth means you really need two bulbs around 10 inches apart at the top of the tanks to get good uniformity of lighting over the whole substrate. And, with two bulbs widely separated you don't have the high growing plants keeping the low growers in shade all day. With 4 bulbs, as you have, you have much too high light intensity for a planted tank, so avoiding algae will be a full time job for you, one you aren't likely to succeed at.

Or, if you like having your lights suspended several inches above the tank, as I do, you can use more light. With 4 bulbs you should have the lights about a foot above the top of the tank, perhaps even higher. That is a very good way to light a tank, because it gets the light up out of the way of doing in-tank maintenance, and it gives you the most uniform light intensity in the tank.

The substrate should be about 3 -4 inches deep at the most, maybe 2 inches in the low areas. Some people use more substrate and some use less, but I think generally those are good goals to shoot for.

Hoppy
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post #5 of 6 (permalink) Old 07-06-2010, 04:12 PM Thread Starter
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thanks to all for the replays.

what hoppy & Hyzer says are absolutely right, but what i read in this forum is that all are talking about increasing the amount of light that's why i get confused.
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post #6 of 6 (permalink) Old 07-06-2010, 05:05 PM
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You will get more "bang for your buck" by adding pressurized CO2 than adding more light. A lot of people learn this the hard way.
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