So my Vatf has been packing on weight and loves all sorts of frozen foods, hes gotten alot thicker since ive gotten him, would now be an alright time to try and add 2 tinfoil barbs? I was thinking 2 tinfoils around 3". He and the giraffe cat get along well but Ive been wanting to add a couple tinfoils as dithers, also to entice him to get on pellets faster.