Bleaching

So I am  very confused now...I had some 3-4 degree temp swings 3 weeks as well as a 2 weeks ago when outside was real hot... and i thought this was the major problem causing my corals to bleach and die off... but then i got a fan in the room and it has kept it 78-79 degrees, it has been a week, and i don't see any improvement in the corals health and i think some are continuing to die off...

I added sand to the aquarium (dead) because it was getting low. The light i have, i put a window screen under it because it heats up the tank too much. so it somewhat screens out a little light, but the corals i believe were used to it.

I feed the corals 1-2 times a week with oyster feast. I tested params... my salinity is 1.025-1.026. PH lowest was 7.9 Ca 415 Mg 1710 (it is lowering by itself, raised it to get rid of bryopsis) Alk is 9.3. 0 Nitrates (which will probably change because my tang is eating all my chaeto. :(  )  So all the params are fine.

I realize the corals won't isntantly heal and recover, but after a week shouldn't they start to recover?

Any help/suggestions/questions i would be glad to hear because i want to get this fixed, it is disheartening. Thanks for your help!


Edited by Goonter - September 11 2009 at 9:38am

Delayed reaction is not unheard of.