Great thread.
Only additive i use other than Amino Acids (which I'm not sure if I even need b/c the tank is so small) is food soaked in selcon. Funny thing is that I feel that my coral seem to get a greater benefit from it than the fish do...maybe due to it containing Vitamin C? I also feel that this product will assist in filter feeding (or is it just feeding the bacteria than in turn the filter feeders feed on?) as it claims, but I have heard others say they do not believe this at all. Great stuff IMO nonetheless.
Might try out some of the Korallen products too since reading this thread...wondering if I should discontinue use of selcon if using something like spongepower?