Flea treatments for rabbits.

I've never had to deal with this before but yesterday I was giving Harmony a cuddle and a quick nail trim when I decided to look at her coat and give it a brush as Drews mega moutling even though she don't seem to be, but I split the coat and saw a flea, one of the dogs must of picked one up on a walk and as the rabbits are indoors the thing on lil H must of come from their, and as I thought I saw frontline rabbit before I searched online for that, and although I couldn't find that I did find sites saying that frontline on rabbits can cause fits or death, so even if I did find it I wouldn't want to risk it, but as I've said I've not done this before so don't know what to look for and was hoping someone else would, so does anyone know of any rabbit flea treatments that work, and if so were do you get it from?