ok, your post mentions several things that need to be addressed. You said you "cleaned" the rocks. How did you do this? Depending on the answer to that, you may have killed off the biologicals on it and it will need to reseed. YOu mention survivors, which means you have had losses..what kind of losses? You also said that you removed the DSB
. This needs to be done carefully, with close watch of the water chemistry aftward. The DSB
was part of the filtration. When you removed it, you removed a big part of your tank filtration and this could have caused an ammonia spike and definitely excess nutrients in the water.
The algae problem could actually be doing you a service while all these other changes are going on in your tank. Algae feeds off the excess.