03-18-2011, 03:40 PM
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With a 50% WC, I don't think you will have any issues. Just test the water every now and then especially if you have recently added fish, cleaned the filter, had wide temperature swings, removed/ pruned plants or believe your water supply chemistry has changed. Anytime an event occurs that you believe will have an effect on N (ammonia, nitrite, Nitrate) I would do a water test.