bleached with sunpower 6x39w

[tibob32]

So, I bleached a bunch of frags (acropora) with my new fixture: sunpower 6x39w on a 36"x24"x16" shallow tank. The fixture was too close to the waterline.

How high should I put the fixture to let my frags recover? I moved it up so that the frags are about 28 inches below the fixture. Will that be enough?

 

[aqua80]

I would say 10-12" above water to be sure then lower slowly as they recover...
these fixtures are strong !

 

[Asureef]

I would say 10-12" above water to be sure then lower slowly as they recover...
these fixtures are strong !

My tank is 16" high also, I wouldn't hang the fixture lower than 8" above the water line. Mines currently at 10" above the surface and acros do just fine even on the sand bed.

 

[allsps40]

I see so many people bleaching their corals when they first get a good T5 fixture. Everyone seems to under estimate the amount of PAR these things put out, especially when a good bulb combo is used. Even going from MH to T5 is a big change and the corals MUST be acclimated to the new lighting, over several weeks. I also see this a lot with LED lighting, the good ones.

 

[tibob32]

they were very few inches away from my past fixture, a nova 4 bulbs, and were transfered under the 6 bulbs probably twice as far from the fixture yet they bleached. That last comment about them being really strong is so true; that ati is probably more than twice as strong as my last one (considering the 2 extra bulbs, better ballasts, active cooling, reflectors...)

 

[pusanpa]

Make sure you have all six bulbs on for around 6 hours.
I bleached most of my corals when i had my full lights for 8.5hr.

 

[tibob32]

I bleached mine with only 4 hours with all 6 (12h with 2 blues)

 

[ange062]

I see so many people bleaching their corals when they first get a good T5 fixture. Everyone seems to under estimate the amount of PAR these things put out, especially when a good bulb combo is used. Even going from MH to T5 is a big change and the corals MUST be acclimated to the new lighting, over several weeks. I also see this a lot with LED lighting, the good ones.

Yup, I bleached all my SPS and even lost a colony when making the LED switch. Saved the rest by reducing both intensity and photoperiod and gradually ramping.