i go by smell rather than readings, i usually do a complete change after a day or two then just wait and test every few days. if it gets stinky or the readings really start going up, change it again.
.25 is nothing to worry about yet. how long have you been curing it? are you use a heater too? keeping it in the dark?
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120S RR tank with 60G basement sump / fuge
Return Pump: Little Giant 4-MDQX SC
Water Movement: Seio 1500, (2) Hydor Koralia 4's
Lighting: 400W SE MH with 14K Aqua Connect
Skimmer: Euro-Reef RS250 with gate valve
Other: RODI, RDSB, PO4 / AC reactor
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