Let's talk about bio load.

[straightrazorguy]

I don't think you will see a sudden anything. I think of it as more gradual thing. It is a biological system, and, depending on your rock, sand, reactors, etc you may or may not be able to process a certain amount of fish waste. The bacteria will adapt and multiply to the point where they encounter a limitation of some sort (usually carbon). If you supply that, they will continue to grow to match the bio-load.

I also think of corals as consumers of nutrients, rather than adding to the bio-load. Am I wrong?