I have had my 60g running now x2wks. Since then, the tank chemistry has me baffled. I had re-used some of my old rock that I had. Some of it was dried but the bulk of it was in a trash can with water in it, pump and heater. So here are the results of week 1: pH 8.2, Ammonia 0.50, Nitrite 1.0, Nitrates 15 and phosphates 0.5. Test today- (week2)- pH-8.1, Ammonia 0.125, Nitrite 0.25, Nitrate 5, Phosphate 0.25-.5, KH 7 and calcium 540. I have an LED light (Pharos) and a sump that is about 15g of water. There is some brown algae (or diatoms??) on the rock(not too much) and the same appearance on the sand. It seems to be in the area where the light falls on the bottom of the sand. I thought I would've had a bit higher ammonia spike?


