I believe rockettheme supports quite a few 3rd party styling which includes K2. Not sure about Tachyon but have you gone into the Template --> rt_tachyon -->Advanced and enable the 3rd party styling ? Is this what you're looking for ?
Thanks. Yeah, I have 3rd party on but it's no improvement. I have managed to get a bit of styling in but I am limited in coding tech. I will keep looking.