hey i think it is ok to split the tetras but i couldn't be certain. i've been splitting mine from day 1 and just have half and then put the other half in the fridge!!
Thanks for the advice everyone. Well I split it in 2 to have 2 warm cups of chocolate this morning and at break time it work out really well I think I will do that from now on and I am going to have my first bar today, well maybe we'll see