I'm more or less debating the algae that covers the tank walls and rocks. Some of mine came from Hawaii and other tanks just developed algae probably from the salt water that the LFS sells. Just a thought.
This is an interesting subject to me since it seems that we're all concerned with growing algae in the tank to feed our opae. Over time one way or another algae will form in a tank no matter what. I can understand why some have more do to different water types used, or less. I know one of my jars I started has very little visible algae in it. A good amount of biofilm is present. The lava rocks were clean and not from an established tank. The salt mix used was mixed with distilled water. Feeding was only a few times. You can see the waste created by the opae so I wasn't concerned whether or not they were getting enough food.
As you can see from the pics below there's very little visible algae on the rocks. There's more than enough waste to support it. The jar does get both direct and indirect light. I did remove the macroalgae since it seemed to not get enough nutrients to grow and keep a dark green color. I assume it's lacking iron.