kuza

never heard of temps causing it, have heard of lighting affecting the color though, when was the last time you changed your lights? what type of lighting do you have? what are your tank parameters? size of tank? also your salinity can cause this if it is too low so run your tests and get back to us.

also when you say high temps, how high are we talking and for how long?

We recently fragged off some zoa heads to go into a smaller tank, the new smaller groupings lost some color for about two weeks or so.. but gradually seems to be coming back.

I change my light last month ago and i have 6pcs. of T5 24w in my 30g tank, im so busy at work i idnt notice my temp is 31C about a month now i didnt know my digital temp is broken so i replace it last 3 days ago and shock when i saw the temp. of my tank. I will check my salinity when i go home later from work. Tanks for the advice i will update later the salinity.

if the tank has been around 31C about a month bring everything back down over at least a 24 hour period as to not shock anything that may be used to the higher temps, I have 3 thermometers in different locations in my tank that I compare to, one stick on to the main display as well as a digital in my overflow, and a reefkeeper elite probe in my sump. with that size tank and that lighting you may have a fun time getting your temp within a consistent acceptable range so keep an eye on it close while you are bringing it all back down to see what you may have to try to keep huge temp swings from happening through the day. good luck and keep us posted.

I have check my salinity yesterday and it was 1.020 sg. and the temp of my tank is 29C. how can i stable 1.025 my salinity?

well do it, as everything with parameters, slowly. Check your salinity levels of your water changes and what I do is add a little extra salt in with the water changes to creep it back up there. Whatever you do, do not just add salt to the tank!

ok thanks for the advice really learned a lot. ill keep posting.