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How often should I do a water change? And how much water should I take out at a time?

As of this morning my ammonia is 0 nitrite is at 1 and my nitrates are 20.

I am new to this hobby. I bought a 400 gallon saltwater tank. I have a sump tank and a protein skimmer. I also bought 250 pounds of dry live rock and 160 pounds of live sand. I put two cat sharks and two sting rays in it. I cycled the tank for a month with some some damsels. My levels went high...

I am new to this hobby. I bought a 400 gallon saltwater tank. I have a sump tank and a protein skimmer. I also bought 250 pounds of dry live rock and 160 pounds of live sand. I put two cat sharks and two sting rays in it. I cycled the tank for a month with some some damsels. My levels went high...