Too much light bad for fish?

cofstl411 · 04-08-2005, 09:41 PM

I have a 125 Gallon tank with two 6 ft. actinic bulbs and 3 250 metal halides. I usually only run the actinics for about 6 hours a day. I just used my metal halides for a couple hours. When I turned them out and went back to just the actinics my fish seemed to act strange. They were huddling together and darting about in a small area. Will a change like that stress them out? I have been reading that the actinics are cosmetic and for my viewing. What type of schedule should I use. I don't have any corals.

I can't believe the difference in the appearance of the fish with the metal halides on. The colors on my fish are so vibrant.

**charlie** · 04-08-2005, 10:50 PM

Is that the first time you had done that? I believe a sudden change like that will cause fish to "stress" ,if that is the first time that has happened. I have all my halides on timers so that the turn off is more gradual, and the fish will get used to the impending darkness.

TROY182 · 04-17-2005, 08:41 AM

I would set them up to come on seperately then go out seperately. that way you can simulate sun rise , noon sun and sunset.

04-08-2005, 09:41 PM	#1
cofstl411 Tenant Join Date: Nov 2004 Location: Cleveland Posts: 87	Too much light bad for fish? I have a 125 Gallon tank with two 6 ft. actinic bulbs and 3 250 metal halides. I usually only run the actinics for about 6 hours a day. I just used my metal halides for a couple hours. When I turned them out and went back to just the actinics my fish seemed to act strange. They were huddling together and darting about in a small area. Will a change like that stress them out? I have been reading that the actinics are cosmetic and for my viewing. What type of schedule should I use. I don't have any corals. I can't believe the difference in the appearance of the fish with the metal halides on. The colors on my fish are so vibrant. Last edited by cofstl411; 04-08-2005 at 09:51 PM.

04-08-2005, 10:50 PM	#2
charlie Keeper of Willis Join Date: Jul 2004 Location: NW Montana Posts: 5,668	Is that the first time you had done that? I believe a sudden change like that will cause fish to "stress" ,if that is the first time that has happened. I have all my halides on timers so that the turn off is more gradual, and the fish will get used to the impending darkness. __________________ 400 Gallon Reef Log Rome wasn't built in a day---neither is a reef

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04-17-2005, 08:41 AM	#3
TROY182 Just Moved In Join Date: Feb 2003 Location: South Carolina Posts: 12	I would set them up to come on seperately then go out seperately. that way you can simulate sun rise , noon sun and sunset.

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