Spinedoc
Brown Belt
If you are enjoying Hapkido, you might want to stay with it. In the Hapkido I learned, I was taught some ground tactics between 1st and 2nd Dan. Not a lot. Granted they were mainly how to get away from an opponent and back on my feet. Not the numerous takedowns and submissions I think BJJ does a lot of.
A guy in our Aikido dojo has trained in both Gjj, as well as another Bjj style. He finds them complimentary, but very different. Our Aikido dojo, while being Aikikai, is not really touchy feely, it's got a very practical feel. Here's why you do this, if you do this, I just killed you.