how long will plants last in low light - The Planted Tank Forum
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post #1 of 12 (permalink) Old 11-20-2016, 07:51 PM Thread Starter
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how long will plants last in low light

i just put some dwarf hairgrass in a new tank and was wondering if the stock 17 watt full spectrum bulb will keep it alive for 8 more days until my new lighting fixture shows up
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post #2 of 12 (permalink) Old 11-20-2016, 07:55 PM
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8 days should be no problem. I've known people to outright grow DHG in those conditions, not that I'd necessarily recommend it. More demanding plants might not fare as well, but you should be fine with what you've got.
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post #3 of 12 (permalink) Old 11-20-2016, 08:01 PM Thread Starter
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awesome good to hear that i didnt set myself up for failure right away lol
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post #4 of 12 (permalink) Old 11-20-2016, 08:03 PM
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How big is tank? You'll also need ferts and a carbon source.
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post #5 of 12 (permalink) Old 11-20-2016, 08:06 PM Thread Starter
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36 gallon ive got about 24 pounds of floramax and 15 pounds of flourite , not sure if that counts as fertilizer and im not sure what you mean by carbon source .. do you mean the activated carbon or co2?

just put a little 2 liter bottle co2 generator together hoping it doesnt put out too much but enough to keep the plants happy

Last edited by Darkblade48; 11-20-2016 at 11:07 PM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #6 of 12 (permalink) Old 11-22-2016, 02:12 AM
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Originally Posted by geisterwald View Post
8 days should be no problem. I've known people to outright grow DHG in those conditions, not that I'd necessarily recommend it. More demanding plants might not fare as well, but you should be fine with what you've got.
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post #7 of 12 (permalink) Old 11-22-2016, 02:23 AM
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You'll definitely be fine..I've got a small amount of DHG growing in a tiny mason jar that gets hardly any light (as an experiment) and it's actually growing better than I expected


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post #8 of 12 (permalink) Old 11-22-2016, 01:29 PM
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Quote:
Originally Posted by Sucram Nosiren View Post
36 gallon ive got about 24 pounds of floramax and 15 pounds of flourite , not sure if that counts as fertilizer and im not sure what you mean by carbon source .. do you mean the activated carbon or co2?

just put a little 2 liter bottle co2 generator together hoping it doesnt put out too much but enough to keep the plants happy
Carbon is the CO2 that you're generating. (Have you started it up yet?) You need some food for your plants. Floramax and flourite will tell you about all the wonderful minerals that it is made up of. Unfortunately, little if any is available to the plants. Think of it as lava rock gravel or sand. You have to provide all the needed nutrition to the plants whether it's through added fertilizers or fish waste.
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post #9 of 12 (permalink) Old 11-22-2016, 01:42 PM
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Think of the hairgrass as the grass on someone's yard. it's needs the same things. Light, co2 and fertilizer. When you startup a tank you want it to all be there from the getgo as opposed to adding as you go. The 17 watt light on a 36G is pretty much nothing so the hairgrass will already be in decline. When you get the stronger light you will still need as source of carbon and ferts since as pointed out by @Kubla the substrate is pretty much inert.
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post #10 of 12 (permalink) Old 11-22-2016, 04:15 PM
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Low light is very doable with hair grass, but to me, low-light is about a watt of light per inch of depth (from 6500k HO tubes or CFLs) or about 1 watt per gallon.

That being said, if your water is clear, it will probably be enough for 8 days. If there's sunlight from a nearby window, you might not need more light at all.
Just watch your plants. They'll tell you if they're okay.
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post #11 of 12 (permalink) Old 11-23-2016, 09:12 PM Thread Starter
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alright , so my light should be here sometime today and i picked up the only fertilizer i could find and that is api leaf zone along with an api master test kit .. few steps closer to where i need to be, ive also got co2 going but as of right now i cant control the output since its the diy yeast co2 with an airstone

UPDATE:
the DHG is doing great .. giving me all kinds of runners to replant and nothing is turning brown .. ive got 1 bottle of yeast and sugar c02 going with an airstone ziptied to my filter inlet along with api leaf zone, fluorite substrate and a odyssea dual t5 fixture

Last edited by Sucram Nosiren; 11-25-2016 at 05:55 AM. Reason: didnt want to double post
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post #12 of 12 (permalink) Old 11-29-2016, 03:26 AM Thread Starter
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this stuff is spreading like wildfire .. the top picture i kinda helped the roots into the substrate as they were just sprawling across the top
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