Hi I am complete beginner to the hobby . Just started my cycle 5 days ago with shrimp. My setup is as fallow : 40kg of cured pukani rock 50kg of Caribsea Arag-Alive fiji Pink I have been doing Ammonia, phosphate , nitrite and nitrate test everyday from the day 2 when i started doing the test the result are as fallow without change. My ammonia is at 0.5 Phosphate 0.3 Nitrite at 0.25 Nitrate at 25 On my 3th day I started to notice a brown algae growing on my rock. Is this normal I have tried to search for any answer and i think it could be diatoms but isn't it too soon for it ?