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What exactly is the cycling process and how do I know when it is and what should all happen??

My tank has been set up for about 5 months. I don't know much about the tanks, but I will try to explain. I have a 30 gallon tank. Whisper 20-40 gallon filter. whisper 30-60 gallon heater. water temp. about 78 degrees. salinty 30. specfic gravity 1.0225. my lighting system is old if that could...

I have a brown sunstance with little green spots growing all over my crushed coral. What is this substance? and what can I do to prevent it or stop it?