How to fill my tank?

Notsolostfish

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Its 36 gallons display and 18 gallon sump. Rock and sand already there. Do i open the rodi on it or fill 5 gallon bucke to know water volume for future dosing?
 

Pico bam

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And how do u know the water volume later on with rocks and sand u dont mess your dosing?
Test kits are your friend. If your just getting started and looking for something affordable/reliable go with salifert. Always dose 1/2-3/4 recommended amount and retest on just about anything you dose. As for the volume I just take an educated guess.
 

Kellie in CA

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I put a bowl on the bottom and poured the water in it so the sand wasn't disturbed much. I did keep track of every gallon that went in. My 40 gallon tank only took 27.5 gallons, and I have pretty minimal rockwork.
 
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