I set up a 55 gallon saltwater tank for a guy that I take care of. I work at a home for the handicapped and I only have time on Sundays to do all the water testing. I have 50 lbs. of live rock which have been in there for about 6 weeks and a blue damsel who's been in there for approximately 4 weeks. Now is it possible, being that I'm testing the water weekly, that I missed the ammonia spike? My ammonia is registering almost 0 and the nitrite and nitrate are a just above zero. I'm running a cs90 wet/dry filter and a bak-pak2 protein skimmer.