I think I figured out my problem!!!

[tiffany89]

Ok, I think I have figured out why some of my corals aren't doing so hot. :wow2:
Half of my zoas are doing great, but the other half of them are doing horribly.
My frogspawns are not extending and nobody is really growing. And my acans are bleaching out. SO I have bought everything and have all the red sea test kits and everything is perfect, so I think its my lights?? I have an LED Fixture (some black box LED from Japan) Power is 120 W
Input Voltage is AC85 - 264V
And the Frequency is 50-60Hz

There are 35 blues
There are 20 whites
Thats all I can Identify about the light fixture.

But it is sitting directly on my glass tops. Is that to close for a 20 gallon high?

 

[brandonmason]

Are they dimmable? They should be suspended above the tank and if they are not dimmable it would be wise to tint them somehow to not bleach or "shock" the corals. LEDs are extremely powerful and I would bet in a 20 gallon you are getting 800 Par or better in the sand. Acans don't do so well with that high of Par

Sent from my XT907 using Tapatalk 4 Beta

 

[ringo®]

Tiffany89;885552 wrote:
But it is sitting directly on my glass tops. Is that to close for a 20 gallon high?

Yup

 

[jennm]

What's the temperature in your tank?

Could be the lights too- whether it's spectrum or heating from the lights.

 

[ichthyoid]

A simple experiment will determine if it's your lights. You can reduce the length of time your lights are on, by ~20 or 25%. If things get better, that was likely it.

Reducing light can be done by the following-

-increasing the distance
(this is a function of the square, so a little change makes a big difference)

-using pieces of screen between the light and corals

-reducing the 'on' time

-dimming (if possible)

I have a 120 watt LED, similar to yours. I had it on a 20L frag tank, and ran the 'blue' side only most of the time. All my Zoa's, etc., did fine.

My $0.02

 

[ichthyoid]

After a second look at your symptoms, I would suggest you check your alkalinity.

I don't have any experience with Red Sea test kits. I would take a water sample to your LFS and get it tested, just to be sure.