hmmm, a bit dubious myself. also check nitrate. if i were to move fish from my planted tanks (nitrate 2ppm) to the new cobe tank (nitrate 50ppm) the fish wouldn't thank me for it. if all water stats are identical then yes just put them in. if anything is different between the tanks fill a plastic tub (ice cream container etc) 1/2 way with tank water from the fishes original tank, then every 5 minutes add say 10ml's of water from the new tank to the tub. keep going till you've doubled the water volume, then remove 1/2 and repeat. after about 60-90 minutes the fish will be much more happier with the move.
obviously this will work with guppies, danio's etc.. not for big fish (they wouldn't be too happy in an ice cream box!!)
hope that helps.