When you add a new fish to your tank it needs to cycle again to develop enough bacteria to clean the waste the new fish produces,your adding fish faster than your tank can develop the bacteria to keep the water pure..result-system crash,add 1 fish wait 2-4weeks add another and so on. Running a tank that small,new and overstocked theres no way your ammonia,nitrate are at zero. And as I mentioned before you also need to test for phosphate,ka alkalinity,magnesium if you want to keep a reef.
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