How high should my light be above my substrate? - Tropical Fish Keeping - Aquarium fish care and resources
 
LinkBack Thread Tools
post #1 of 7 Old 02-25-2013, 08:25 AM Thread Starter
Member
 
How high should my light be above my substrate?

I have a 36 gallon freshwater Bowfront with a Coralife dual light fixture.The bulbs are colormax 31W T5H0 and the other is 6,700K T5HO.I have a sanded bottom with a lot of live plants.
I'm getting hair algea on my plants and it wont go away.I run my light for about 10-12 hrs a day.Tank sits across the room from a window but I have the shaded turned so the light isn't hitting it directly.When i'm home and it's pretty light in the room I will turn my lights off until the sun moves.
I was thinking my light might be to close to substrate or I have the wrong bulbls in it.I have Oto's to take care of the other Algea I get.It's just the hair algea I don't like.Is there also a fish that will eat this alge?
Bluydgrl is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 02-25-2013, 09:22 AM
JDM
Member
 
JDM's Avatar
 
Can't comment on the light fixture itself but typically they just sit on top, distance to the bottom is fixed and you are better to adjust duration of the light first. I think that 10-12 hours might just be too long in your situation, I read others that are as low as 8 or 9 hours. I do well with 14 hours but I run LEDs and that period seems to just work well for me... each tank balancing act is different.

If the fixture is too much, changing to a lower wattage or different diameter bulb might be in order rather than raising the fixture... others can comment better on that.

Jeff.


Total years fish keeping experience: 7 months, can't start counting in years for a while yet.

The shotgun approach to a planted tank with an LED fixture

Small scale nitrogen cycle with a jar, water and fish food; no substrate, filter etc
JDM is offline  
post #3 of 7 Old 02-25-2013, 09:25 AM Thread Starter
Member
 
Quote:
Originally Posted by JDM View Post
Can't comment on the light fixture itself but typically they just sit on top, distance to the bottom is fixed and you are better to adjust duration of the light first. I think that 10-12 hours might just be too long in your situation, I read others that are as low as 8 or 9 hours. I do well with 14 hours but I run LEDs and that period seems to just work well for me... each tank balancing act is different.

Yeah the lights might be to brite
Thank you Jeff


If the fixture is too much, changing to a lower wattage or different diameter bulb might be in order rather than raising the fixture... others can comment better on that.

Jeff.
Posted via Mobile Device
Bluydgrl is offline  
post #4 of 7 Old 02-25-2013, 10:44 AM
Member
 
BarbH's Avatar
 
I would definitely decrease the amount of time that the lights are on for. Are you using CO2, in this tank? When I was running my 50 gallon planted I had my lights on for about 8 hours a day and that was with using a single T8 fixture. Those T5ho are putting out a lot of light and you are getting imbalance of light and nutrients I would think.
Posted via Mobile Device
BarbH is offline  
post #5 of 7 Old 02-25-2013, 11:02 AM Thread Starter
Member
 
Quote:
Originally Posted by BarbH View Post
I would definitely decrease the amount of time that the lights are on for. Are you using CO2, in this tank? When I was running my 50 gallon planted I had my lights on for about 8 hours a day and that was with using a single T8 fixture. Those T5ho are putting out a lot of light and you are getting imbalance of light and nutrients I would think.
Posted via Mobile Device
No CO2..Just Seachems Flourish every 2-3 times a week.Do you think I should go with different bulbs?Just would hate for my plants to die on me
Posted via Mobile Device
Bluydgrl is offline  
post #6 of 7 Old 02-25-2013, 12:50 PM
Member
 
BarbH's Avatar
 
What type of plants do you have in your aquarium? I would personally start by reducing the amount of time that you have the lights on for and see if that helps with the hair algae issue. You might find that you will need a different fixture, but first I would start with the duration of the time that your lights are on and see how that works. You also mentioned that the tank is across from a window, what direction is the window facing? Even with having shades drawn across the window you could be getting quite a bit of light coming in from there.
BarbH is offline  
post #7 of 7 Old 02-25-2013, 01:38 PM
Member
 
Byron's Avatar
 
Others have correctly identified the issue and how to fix it. I've done a fair bit of experimenting with this problem which I have also had (but no longer).

The first step is to reduce as much as possible the ambient daylight, especially if it is direct sun. And to illustrate how this can impact: I noticed for 2 or 3 years that brush algae (I am thinking this is probably what you are referring to) always took off in the summer. It finally dawned on me that the brighter and longer daylight could be the reason, so for the past two summers I kept the windows covered all day with both shades and heavy drapes. End of algae increases.

Second issue is the brightness of the tank light. Here, before considering different light (which would mean either T5 NO tubes as you now have HO, or a new fixture altogether), I would lessen the duration. I have my lights which are T8 and moderate, on for no more than 8 hours daily; any longer and brush algae increases again. You can go down to 6 hours daily, according to George Farmer. I would reduce down to about 8 and see if it helps.

You won't see the existing algae disappear, but the goal is to not have it increase further.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
Byron is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
High Light. No Co2 Welsh Beginner Planted Aquarium 1 11-19-2011 03:21 PM
High ammonia after partial substrate change? Freddiesbuns Beginner Freshwater Aquarium 14 03-30-2009 07:55 PM
Substrate for 55g low light Jasey Beginner Planted Aquarium 14 02-29-2008 06:50 PM
substrate and light porksnorkel Beginner Planted Aquarium 10 08-23-2007 09:16 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome