Tyrannocytes are an amazing new Tyranid genus and make great pets. Following these simple steps will lead to a long and happy life for both you and your transport spore.
Your Tyrannocyte should be exercised regularly. Remember that he is not an immobile pod and should be walked every day. He is happiest when left to wander around the battlefield after disgorging his breakfast of Brain-Leeching-Devourer-Death upon your foes.
What do they eat? Well the good news is that your new friend will eat pretty much anything with a pulse. He is particularly fond of squishy cultists and crunchy space marines. Your opponent may want him to eat Heavy Bolters which is fairly disagreeable and anything with a 'Nurgly' tinge might give him indigestion. Under no circumstances should you let him play with Tachyon Arrows, solid shot Railguns, Demolisher Cannons, or indeed any strength 10 weaponry for that matter.
Remember that these are monstrous creatures and significantly larger ones than other Tyranids in your menagerie. You should give careful thought to his bedding and packing him in foam works best. Although his posterior tentacles look spindly, they will adequately support him for regular activities and are robust enough to survive transportation and accidental dropping, as long as you have used plastic glue to 'weld' them in place. If your Tyrannocyte is too big to fit in your transport case, you might want to think about keeping his top half unglued and separate from his bottom half. This has the added benefit of being able to spontaneously mutate him into a 'Sporocyst'.
Your new pod pal plays well with others and you should always keep him company with a Dakkafex or a brood of Devilgaunts or, well, anything really except maybe gargantuan creatures or another pod. Remember that your buddy is a transport pod and not just a dedicated transport either so you can change your mind about what to run him with at the start of a game if you want to or even run him solo. He really is a most agreeable creature!
The Tyrannocyte, sadly, does not have a very good aim and is somewhat incontinent in the shooting phase. If you dont want him to make a terrible mess on the board, you should stick to Deathspitters. It would be very unfortunate if his blast template scattered onto your own troops and accidentally vaporized them.