i suspect test kit as well i had a api and my alk reading was around 9-10 and with elos was at 4-5 was having big ph swings but never thought that much of a difference was possible
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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