david the last time i checked my nitrites were 0, ammonia,0 and nitrates were 40 (this is a new set up so it has come down from the 160ppm that it was a few weeks back), a day before my scheduled water change. the macros were all growing like crazy, i would say the grape algae probably had doubled or tripled in volume in the past 3 weeks. i have been dosing daily a two bottle supplement by kent called "nano reef part A and B" which has iron in it. i just have a HOB filter (which is made for a 70g tank). i use a couple hours of natural sunlight in the morning and a 36watt coralife 50/50 bulb. i have about 12lbs of live rock in there, and just a few animals (tiny goby, 3 pep shrimp,2sm astreas, 1sm tonga conch, 3 tiny hermits and 5 nassirius snails). there are also a ton of almost microscopic creatures on the glass that look like starfish center body and 5 legs. what the heck are those? i am also noticing alot of pink and purple algae begining to grow. john