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Hello all, I have a 30g tank with live rock and sand substrate with 3 chromis. I have 1 powerhead in now with a 160gph output. I have heard that I should get 2 in the tank and not have a circular flow but have them aimed at the front of the tank. Anyone have suggestions on placement? please...

Hello all, I have a 30gallon tank that has been cycling for about a month. I have 35lbs of live rock and sand as my substrate with a protein skimmer running. I have 3 green chromis and some hermits. I have a problem with my nitrite. My ammonia seems to disappear but I can not seem to get my...