01-03-2007, 11:42 PM
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Hi Roger, Happy New Year!
As long as the power head continues to run, the water should be fine for up to a month, but watch your salinity/spg because evaporation will cause that to fluctuate. My husband and I do the same thing with 50 gallon garbage pails, 1 for DI water and one we use for mixing into saltwater. If the circulation stops, then the water will get stagnant quickly, so throw it out, clean the barrel and start over.
As for cycling, no... unless you place something like live rock or live sand in the barrel... with no waste to feed bacteria, the water should remain uncycled and ready to use. I would suggest not trying to cycle water in that barrel, chances are all you'll get is a mess with a lot of water thats not safe enough to use for water changes.