I've had a betta, 3 guppies and 2 platies in a 10 G forever now and my sister recently purchased a male betta and used my 2.5 G quarantine tank for it, so I took pity on the poor guy and decided to leave the 10 G to him. Tank is still cycling, but would it be wise to introduce new fish all at once as I move the old ones to the new tank, or to do so one by one? Since I have six fish already I'm unsure about stocking in general. Maybe a couple more platies? Apple snail? Any suggestions?