20K. I was hesitant to go with the 20 at first because it's so blue, but side-by-side with the 50/50 PCs on the other end of the tank, I much prefer the 20K. I'm hoping CoralVue is able to solve the problems with their DE 14K, as I think this temp would be ideal for my purposes, but for now the 20K is doing great things.

Chris