Its hard to say but your mycelium might be drying out as it grows, blue is an indication of oxidation in most hallucinogenic varieties. I read somewhere it's not actually the psilocin if I find it I will source. I wouldn't be worried, just cautious, if any other funky colours start popping in I would get them out of there, as well on top a fridge may slow things down, when I did mine I kept it beside the furnace, in the cold room. It isn't cold, but its not hot either. I forget the real temp's for colonization, do a google search with your variety and adjust your stats accordingly.
Peace