New bulbs ????? What's the min amount of time for mh to be on safely

[BrentH]

I changes out my bulbs all at once ... And seem to be getting pale lookin sps and a few bleaching stn etc.. I switched from radium 400 20k to ushio 400 20k light run for 6.5 hours a day and I have some t5 that run 11 hours that basically just blue my question is what's the min I can go 5 hours be ok?

 

[BrentH]

I also have been carbon dosing for the past 5 weeks vinegar but my no3 is still 10 ish and po4 0.03 so I don't think the corals are starving or anything alk at 8 cal 430 mag 1500 (I know high )I also have egg crate 1 layer I can put over the tank to shade a little?im
Going to pismo beach tomorrow for 3 days. I hate leaving my tank I always am a little nervous

 

[BrentH]

One note I've observed is the only corals not affected are my stags which can handle more lighting I think? Everything else seems stressed

 

[Amphiprion]

I changes out my bulbs all at once ... And seem to be getting pale lookin sps and a few bleaching stn etc.. I switched from radium 400 20k to ushio 400 20k light run for 6.5 hours a day and I have some t5 that run 11 hours that basically just blue my question is what's the min I can go 5 hours be ok?

I would do something to reduce intensity for a while, be it raising the lamps or using some screen or eggcrate to block some of it. The whole process is rate-limited, not time-limited. In other words, reducing photoperiod would reduce damage being done, but damage is still occurring--just for less time. If you reduce initial intensity while acclimating, you can actually prevent damage from occurring in the first place.

 

[BrentH]

What's the average photoperiod for hilides when there not new

 

[CHSUB]

how do you like the ushio 20k? i found them to blue for my taste.

 

[BrentH]

The radiums seemed bluer to me I'm running on lumatek ballast

 

[Amphiprion]

What's the average photoperiod for hilides when there not new

I have no idea what the average is these days . I hear 6-8 hours being tossed around quite a bit, with outliers on either side. Mine are on for about 8 hours, with 6 hours of both being on (i.e. maximum intensity) within that time frame. Again, though I do not really change that photoperiod, at least not purposefully.