Im having a hard time telling if I am seeing a bleaching of the coral. I have seen some favorable changes such as a montipora ture undata changing from all brown to a green body with a purple rim and ridges, and some green slimer frags go from browned with no extension to bright green with some extension. because of the above changes im not sure if these two corals are going through the same thing.
1st was claimed to be a purple bonsia when purchased. When I got it it seemed mostly browned with yellowish polyps now it appears to be pale purpleish especially at the encrusted base. Here are 2 pics 2 weeks apart.
2 weeks later
2nd is an unknown acro that when purchased was mostly brown with white polyps now the upper side facing light appears to be much paler and the underside is still brown. 2 pics 2 weeks apart
I also have several chalice frags that have undergone the same conditions and look great and they are only 3-4' lower in the tank. This pic is of my undata which was also kept under the same conditions and incredible change. This is in the same location as the above frags. Before being place in this tank it was completly brown like, well you know. Now This.
Lighting: Apollo LED
fixture. 55 leds running at 2 watts each for a total of 110 watts. 40 blue/15 white(20K), light is approx. 1.5' off the water and blues run from 9a-9p and white are on from 11a-8p with 4 30min periods during that streach with no whites on.
Tank: 20g High. All coral shown is placed about 4-5" up in the tank.
Acclimation: During acclimation I had the blues on from 9a-9p, and the whites on 1 hr then off 1 hr over a 8 hr period. I increased the whites on by 30min, every 3-4 days. even now the whites are not on for a full 8hrs yet. I unfortunatly have the light as high as it can go as the tank sits on to of an entertainment center and the light is hanging from a relativly low ceiling in my basement.
I hope this all helps. I am personally not sure because before I got this light all my coral was kept in my DT where my t5's were under powered. for that tank. So I never had to deal with bleaching and therefore not really sure what to look for. Anyway thanks again