Advice Required for lighting periods

globaldesigns · #1 10-07-2010, 07:18 PM

Hello Everyone,

I had a wierd thing happen this summer, lost many sps frags and colonies. Everything was perfect, even had Kevin @ Red Coral do testing... But still it happened. Things have stabilized and corals are slowly coming back.

My question is about the lighting period. I was lighting for 11 hours a day, continously. I have 2X250W MH with 2x5ft T5HO... I just changed it last night to break it down to 9 hours total, a 4 hour period (8am to noon) then a 5 hour period (5pm to 10pm). This is a total of 9 hours.

With this new timing, I have removed 2 hours, plus gave the corals a 5 hour break between lighting periods, just in case things are too much.

I want others advise, what do you think?

Specs:
Hamilton Belize 5ft fixture
2X250W MH
2X5ft T5HO
MH bulbs are 10K ushio - Love these as they are very white, no yellow
T5HO are Hamilton's that came with it - Actinics

Please note that fixture and bulbs are about 6 or so months old

Thanks for any advice in advance.

Rick

DiverDude · #2 10-07-2010, 07:26 PM

Far from being an expert on this but my thought is that the sun does not rise and set twice in a day. Ergo, such a schedule might screw-up their 'internal clocks'.

Anyone have anything more concrete ?

Atomikk · #3 10-07-2010, 08:09 PM

What I found works amazingly well for my system is to have a slow progression of light intesity and spectrum. I have T5 actinics and 400W Radium 20K. The T5s go on first to ease corals and fish into the day. Then only one of the MHs turns on. After 2 hrs, the second MH turns on, but the T5s turn off. Corals should only be subjected to about 4-5 hrs of intense light (whatever spectrum, 10K-20K). Otherwise they photosaturate, and can recess. After the last MH bulbs turns off, the actincs turn on to again ease the fish/corals into complete darkness.

HTH

globaldesigns · #4 10-07-2010, 08:43 PM

Quote:

Originally Posted by Atomikk

What I found works amazingly well for my system is to have a slow progression of light intesity and spectrum. I have T5 actinics and 400W Radium 20K. The T5s go on first to ease corals and fish into the day. Then only one of the MHs turns on. After 2 hrs, the second MH turns on, but the T5s turn off. Corals should only be subjected to about 4-5 hrs of intense light (whatever spectrum, 10K-20K). Otherwise they photosaturate, and can recess. After the last MH bulbs turns off, the actincs turn on to again ease the fish/corals into complete darkness.

HTH

Cool, great advice... can anyone confirm this, was/am I hitting them too hard?

reefwars · #5 10-07-2010, 09:18 PM

Quote:

Originally Posted by Atomikk

What I found works amazingly well for my system is to have a slow progression of light intesity and spectrum. I have T5 actinics and 400W Radium 20K. The T5s go on first to ease corals and fish into the day. Then only one of the MHs turns on. After 2 hrs, the second MH turns on, but the T5s turn off. Corals should only be subjected to about 4-5 hrs of intense light (whatever spectrum, 10K-20K). Otherwise they photosaturate, and can recess. After the last MH bulbs turns off, the actincs turn on to again ease the fish/corals into complete darkness.

HTH

i do the same if you think about it your trying to mimic where it comes from, i start with t5's in the morning then go halides for about 4-5 hours then i use actinics in the evening.its all done by a timer so i dont mess it up.

in my new set up i plan to phase in moon phases and seasonal time differences

cheers

globaldesigns · #6 10-07-2010, 09:28 PM

Thanks, I appreciate your comments.

This is what I just changed it to:

T5's turn on at noon, MH's turn on at 5PM, then turn off at 10PM, T5's turn off at pm

I think this is better, maybe my slow recovery is due to too much blasting of light.

Your thoughts on my new configuration?

Atomikk · #7 10-07-2010, 09:31 PM

I would keep the T5s off until both MHs turn off,then turn them on. Personally, i think that it is unnecessary to keep them on during the 'day'.

reefwars · #8 10-07-2010, 09:37 PM

i think its much better. alot of coral react differently and change when its dark so its stressfull to do so more than needed .
also distance from the coral is a big factor i had to tinker with my height to get good growth, now any thing i add out grows my tank in a few months.

glad to hear your tank is making a recovery, sometimes its slow at first and then your growth takes off again

cheers