The reef complete is a very small amount (maybe 4ml for 5 qt. bags of food. It was used on accident one time and the consistency of the mix ended up being a little better due to it, so I just stuck with it. It seemed to make the reef roids not "clump" into chunks. Where before it did clump and I always had little chunks of stuff with reef roids and some of the mysis. Previously I was using SeaChem Reef Plus and that is when I grabbed the wrong bottle lol. I dose reef plus now as my doser had a spare slot, so it got removed from the mix and the reef complete mixed in.
Worst case, the fish have strong bones, right? lol
As for selcon or reefsnow, I do not use it in that mix. Selcon is used if I have to mix up food that has medicine in for QT and hospital tanks.