Aquatic life t5 bleaching

[ashields4611]

I had a 4x54 for my tank and had slow growth. I upgraded months ago to the 6x54 and have noticed that i get a lot of corals bleaching.

This is on a 75 with ati bulbs.. Should i switch back to the 4x54?

I cant move corals and not too many shady areas

 

[Drae]

Just raise the fixture up a little bit. These fixtures are very capable especially using ATI bulbs.

 

[Michigan Mike]

What is your photoperiod?

 

[foundnemo11]

8 hours day time 12 morning dusk.. I cant raise the fixture due to the face its on legs

 

[Drae]

??? you have 2 user names?

 

[zombiereefer]

yes those lights are the second most powerful t5s next to ati. there is a lot of numbers out there i would just run your lights for 8 hour total. 3 bulbs for 2 hour and all 6 for 6 hours. if you have ati bulbs thats a great light for a 75 gal. and thats what i had on my 75gal and it was growing sps in the shade lol. seriously

 

[foundnemo11]

Should i switch to te 4x54? I like leaving my lights on for 12 hours