Healing Aurora

So basically I have a Kolto tank that you can walk into and I was wondering is there anyway (not through dialog more like a trigger?) to make it so when you walk into the tank you will heal. Now I do have an idea but I have no clue how to go about this. My idea was to "reverse" the effects of poison (heals you instead of hurts) and make that now "poison" get cast into the PC when he enters the tank. So my question(s):

1. Is the even possible?

2. How would I go about doing this?

Thanks-Supreme Kotor