It is diet soda.Use it if ur tama is xtremely overweight.I wish it came up more often when my tama is a child.I always feed it LOADS of snax so that it can win BUMP more easily.
Happy 2 help u!
I had xactly the same prob when i first got my tama.
U learned the easy way.I had 2 buy it!
Oh well PM if u need any more help!