2 years ago I was all for Rabbits, now I don't necessarily feel the same. I've probably had over 20 of them in reef tanks, and never had a problem with either S. virgatus or S. doliatus (assuming you mean one of those by "two bar"), but I've now had issues with foxfaces, orange spots, and black spots, at least when they are full-grown adults, and there is no algae present for them to graze on. The majority seem safe, but again, I've had issues with them.