02-04-2008, 08:48 PM
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i'd fill the new tank 3/4s of the way, start the filter, and let it sit overnight.
tomorrow, empty the 2.5 by about a quarter- and then add a cup of the new tank's water every 15 minutes or so, until it's all full up. that should help him adjust to the new temperature and chemical balance a little-
to move him i'd try and gently scoop him into some sort of big container, along with a good amount of the old water. then sort of let that container float on its side in the new tank. hold it up so it doesn't sink to the bottom, but submerge it enough so that he can choose to swim into the new environment at his own leisure. when he's in, you can empty the rest of the old water into the 10 gallon. put fresh tap in if there's any room left.
if you've got any ornaments from the old tank stick those in there too- and if you've got an old nylon stocking, rinse it off and put the old gravel in it, and plop that in the new tank. the old bacteria should speed things up
go easy on the feeding for a little while and don't mess with the gravel or filter. oh and make sure there's an air stone in there- goldfish really need that.
your new tank will probably become very cloudy within few days. this is the tank not being able to handle the waste being produced- try and change one gallon of water two times per day.
and come back to ask more questions if you need help