They probably got sunburnt, or the aquarium equivalent of that. If corals get too much intense light too suddenly, it can stress them.While I was gone on a mini vacation, my light somehow switched to a different setting, in which it had 100% on both channels. Wayyyy too bright to say the least.
The corals looked horrible and I thought they were all going to die. But I blacked the tank out for 2 days, and then introduced them to sunlight for the next 4. Now the lights are on 50% of what they usually are.
So should I reduce the temperature? I don’t think this is the problem though.
Also could a lack of nutrients cause white coloration?
Yes, that was my thought as well. (Aka getting bleached)They probably got sunburnt, or the aquarium equivalent of that. If corals get too much intense light too suddenly, it can stress them.
After a few weeks of 50% light, slowly increase it a little bit every 2 weeks. This will allow you to increase the intensity slowly over time and they shouldn't go into shock.
How warm is the water?
Try to keep the temperature around 24-26C (75-79F). It's ok if it goes up to 27-28C but don't let it go higher than 28C (82F).
Lack of nutrients won't cause the coral to fade. Corals naturally grow in water that has a very low nutrient level and they struggle when the nutrients (ammonia, nitrite, nitrate, phosphate) get too high.
Yes, I am aware of this. That is why I have the tank setup the way I do.Hi,
I would watch the placement and amount of coral you are adding. Some corals will fight (sting) and this could cause issues. In the past whist observing my S/W tanks at night (use a red light), I did see this happening.