my only other suggestion is where in your tank do you take your test water from? most people just dip near the surface for testing, now if you have inadequate flow or the flow doesnt circulate properly you could have "deadspots" or areas in the tank where you have a build up of ammonia/nitrates.... try taking samples all over your tank, or use some purple up or any other milky suppliment to "test" your flow...... other then that im sumped...
Steve
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