05-27-2008, 06:00 PM
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Start by taking half of the water out and put it into the new tank. Your filter should still be able to run like this unless you have a really short intake. The move all your plants, decor, and heater over (unplug 15 mins before moving and leave unplugged for 15 minutes after), do not let anything dry out. Then, being very careful and not dropping rocks on the fish or back into the bottom of the tank, scoop up your gravel little by little and move it to the new tank. If the water gets a bunch of junk in it let it filter out for a few minutes. Decorate how you want it, and then very quickly move the filter over. You can at this point move the fish over, I'd suggest getting a few plastic bags from the LFS so you can at least float them with the top open and proceed to acclimate them like you usually would but you don't have to net the fish out. Once you have them in there you can move the rest of the water. This shouldn't cause any more than a mini-cycle, just keep an eye on your parameters and try not to handle the decor more than you need to. Don't rinse anything.
However...if the tank if going in the same spot as the 10 gallon, I'd go buy a couple of those 5 gallon rubbermaid totes, rinse them real well, move everything into those (hang the filter on the side) and then set up the 15. A bit more stressful but oh well. People have moved fish farther than that like this.