75 gallon planted tank

  • We are currently upgrading MFK. thanks! -neo
Paulbearer

Paulbearer

Fire Eel
MFK Member
Jul 1, 2008
1,340
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68
Marion, NC
Would a double 6700k fixture be enough for a 75 gallon tank with low light easy plants? I'm not looking to do any co2 or anything except some fertilizer tabs. Also, besides anubias and java fern, any other suggestions with above lighting and will also have a 48" led on it also. Thankd

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108watts and it's the Odyssea fixture.

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What's the height from the top if the substrate to the light? Will the light be suspended or sit on the tank?

I've used that same type fixture on a 90 and it was medium Par output. Watts isn't the main importance nor is color spectrum even though they do play a factor. PAR intensity is the biggest factor. With a 75 being shorter then a 90 you may need to raise the light 2 to 6 inches above the tank to tone it down to a lower light level to keep algae issues down. You can do this to find the sweet spot for your lighting needs.

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Aquaticfan said:
What's the height from the top if the substrate to the light? Will the light be suspended or sit on the tank?

I've used that same type fixture on a 90 and it was medium Par output. Watts isn't the main importance nor is color spectrum even though they do play a factor. PAR intensity is the biggest factor. With a 75 being shorter then a 90 you may need to raise the light 2 to 6 inches above the tank to tone it down to a lower light level to keep algae issues down. You can do this to find the sweet spot for your lighting needs.

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Click to expand...


While there is some debate over color spectrum importance I can personally say that 6700k or even 10000k is FAR FAR superior to say a 2700 or an 18000, it's ridiculous the difference it makes for growth.
 
Aquaticfan said:
What's the height from the top if the substrate to the light? Will the light be suspended or sit on the tank?

I've used that same type fixture on a 90 and it was medium Par output. Watts isn't the main importance nor is color spectrum even though they do play a factor. PAR intensity is the biggest factor. With a 75 being shorter then a 90 you may need to raise the light 2 to 6 inches above the tank to tone it down to a lower light level to keep algae issues down. You can do this to find the sweet spot for your lighting needs.

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Click to expand...

It will sit on top and it's a standard 75 at 21" height.

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Went ahead and got it...I figured with the current 48" Led and the 48" double T5HO, 6700, 108 watt that I wouldn't have a problem with low to medium light plants that I want to keep. Thanks for all the input.
 
Paulbearer said:
Went ahead and got it...I figured with the current 48" Led and the 48" double T5HO, 6700, 108 watt that I wouldn't have a problem with low to medium light plants that I want to keep. Thanks for all the input.
Click to expand...


The biggest issue you may end up with is to much light intensity and you will have a problem with algae growth wanting to go crazy. I think you will end up with higher light then low light.

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Aquaticfan said:
The biggest issue you may end up with is to much light intensity and you will have a problem with algae growth wanting to go crazy. I think you will end up with higher light then low light.
Click to expand...
More medium than high.Have plenty of plants, watch the photoperiod, and you should be fine.
 
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