Why not just use water changes on a regular schedule? I had a huge bioload in a 10g for a long time, eventually the water changes were just not enough and I started to grow brown hair algae. I had to feed a lot to keep the corals and fish healthy. I tried NOPOX and lights out and it did not work. Why? Probably because I could not get to the root of the problem, too much food and waste for the water. Even with water changes. I have a 30g now and have absolutely zero issues. I feed lightly, ensure all food is consumed and I change 10% of the water every Sunday at the same time 2pm. Consistency is what is needed. I am willing to bet that there is some over feeding going on.