11-03-2009, 05:30 PM
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If the drop in pH is due to cycling, then it should come back up during the course of some water changes. It would be a good idea to work on resolving that before adding fish. Once fish are in the tank water changes will be needed, and with a higher pH in the tap water, this is going to fluctuate the tank water until it stabilizes. That was my concern and what I wished to point out. If the tank is completely cycled, small 5 - 10% water changes every few days between now and the time the fish go in would be a good idea to adjust and stabilize the pH before the fish have to survive the changes. I would not touch the gravel or filter media, just removing water from the surface.
Also, please keep in mind that for the bacteria culture to continue to survive and reproduce, they can't be without food for long. If you performed fishless cycling you were adding ammonia to feed that bacteria. Fish waste will supplement in place of the ammonia now that cycling is done, but don't wait too long before adding something for food for the bacteria. If the bacteria culture begins to die back, the tank will experience a mini cycle when fish are added, until the bacteria growth picks up and begins to reproduce again to accommodate the new waste levels. Some fish can handle that just fine, others may not.
Good luck to you!