Hi Cathy,
While I was away the tank was topped up with tap water, Since arriving home I have installed a ro/di system and have been topping it up with ro/di water. The two water changes were done with RO/DI.
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Adam
 90 gal reef, 30 gal sump, Tunze 9015 skimmer, 2 X Tunze Turbelle Stream 6125, Coralife Aqualight Pro 2x 250 w DE & 2x 96 w PC, 9 w Turbotwist UV sterilizer, 2LF phosban & GFO reactors
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