11-06-2006, 11:26 AM
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Is there a difference in pH with both tanks? If so, by how much? If it's more than +-1, then there maybe something effecting the pH. If there is a big difference, then floating the bag and adding water slowly into it is the best option, which you already are doing.
Also, since you have sand susbtrate, I would put a pre-filter sponge in the filter intake, to prevent any sand from getting into the filter. Without it, the sand may damage the filter.