11-30-2013, 05:06 AM
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Hello, I would say waterchange is needed. Nitrate is the end result of bio cycle of your aquqrium. Fish food and waste produces ammonia which is processed into nitrite by bacteria. Other bacteria process nitrite into nitrate. Nitrate is used by plants, but often accumulates faster than plants can take it up. You tank is working like it should because you have no ammonia or nitrite. Ammonia and nitrite are very toxic to fish and usualy only accumulate if somthing is wrong with your bacterial colonies. Nitrate can be expected to accumulate between water changes, especialy if you've been feeding a lot or your tank is densely stocked. Best way to keep nitrate low is regular scheduled waterchanges. Always use seachem prime to condition tapwater before refilling tank.