I just finished checking my water paramaters and have a question as to what my next step should be. I have a 60 gallon tank with 3-4 inches live sand and about 60-65 lbs of un-cured live rock. Initially my ammonia was off the chart for my test kit. It has since come down to about .25 ppm. However the nitrate's are about 15 ppm and the nitrites are around 5.0 ppm 8O. My question is should i do just a 10% water change or should i do more like a 50%? Any words of wisdom would be greatley appreciated. BTW there is a small crb hitchhiker that seems to be doing fine. I think he is an emerald crab.