Go Back   Aquarium Advice - Aquarium Forum Community > General Aquarium Forums > General Hardware/Equipment Discussion

Join Aquarium Advice Today
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
Old 10-30-2005, 11:04 PM   #1
Aquarium Advice Activist
Join Date: Oct 2005
Location: Los Angeles, CA
Posts: 103
How long to run MH lights?

Hi all,

I was wondering how many hours per day folks recommend running MH lights. I have a 58 gal tank with depth ~2.5ft and one 400W 20k MH bulb. Currently the tank has only LR with some small corals, but I plan to get more more; eventually a clam would be nice.

I have read that it's unnecessary to run the MH lamps more than about 4hr per day. What do you think? Should I supplement this with PC or VHO lamps while the MH is off, or will NO suffice?

Thanks for any advice.


bromion is offline   Reply With Quote
Old 10-31-2005, 11:45 AM   #2
AA Team Emeritus
BillyZ's Avatar
Join Date: Apr 2003
Location: Western NY
Posts: 4,064
I don't think I've ever heard of only need 4 hours a day of your daylight lighting... most reccomend a 10-12 hour light cycle on an established tank.

If you're still going through your initial nitrogen cycle on a new tank, I could understand the reduced light schedule to try and cut down on the amount of algae you could get at that stage, but normally a 10-12 hour cycle is typical.

Myself, I have my Actinics on for an hour by themselves, then my 10k lights come on with the actinics for 10 hours, then just the actinics by themselves again for an hour.


Acronyms and Abbreviations
BillyZ is offline   Reply With Quote
Old 10-31-2005, 11:55 AM   #3
Posts: n/a
If you think about it, the sunlight over the tropics is usually about 8 to 10 hours a day. In trying to re-create this in our tanks, the white light part of the system should be at least that. This allows your light loving corals to soak up the energy for the Zooxanthellae to thrive and feed the corals. Keep in mind that the darkness stage is just as important..Most of the reasons for having the blues come on an hour before and stay on an hour after is to create somewhat of a sun up, sun down effect.
  Reply With Quote

light, lights, long

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Plumbing a long run under my house? jhampton_wsu General Hardware/Equipment Discussion 6 02-15-2009 01:23 PM
How long should my Nova T5 run daily? flyingfish 2626 Saltwater & Reef - Getting Started 3 09-25-2008 12:33 PM
How long do you run your UV sterilizer? evercl92 Freshwater & Brackish - Planted Tanks 1 03-11-2007 11:21 PM
How long should i run my lights? kaz Freshwater & Brackish - Planted Tanks 9 01-06-2007 09:25 AM
How long should I run my UV light? Hookemhorns_98 Saltwater Reef Aquaria 2 10-04-2003 10:09 AM

» Photo Contest Winners

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 05:26 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.