Damsels w/ bad attitudes

Like a lot of people, my first fish were damsels. Three weeks ago we introduced a lovely yellow tang (he's doing fine now.. although he was quite shy and timid about eating to begin with) I've never seen the damsels (2) harrassing him in any way until a couple of days ago. These guys think they own the whole tank! Although he ignores them for the most part, they are truly becoming pains to keep. Now, I'm stuck with the dilema on what to do with them. The LFS will not take them, and my friends laughed at me when I offered them as gifts (gee... I wonder why). What should I do with these little guys? Also, any suggestions on fish that would live well with a tang? (taking the size of the tank into consideration... do not want to overstock)
Tank has been established for seven months. (adding livestock slowly)

75g
68lbs lr
12lbs lace rock
8 turbo snails
2 emerald crabs
2 cleaner shrimp
2 horseshoe crabs

Thanks for the info, Oliver. I have a small 20g tank that I once used for goldfish... perhaps that would make a more suitable home for the damsels? Or would it be too small? Yes, my tank is set up for a reef although I have yet to purchase any corals, etc. (I'd love to have a fox coral... would it be suitable for a beginner?) The tang is eating well, and has variety in his diet. Along with frozen foods, nori, and grazing for algae along the rocks, he also gets treated to some red gracillara from the refugium.


Euro-fill 125 sump/refugium/18 watt lamp
Seaclone 100 skimmer
Rio Hyperflow 14
Sea Swirl Oscillator 3/4
48" Aqualight Advanced

I think that's it. Anything important that I'm missing? Thanx!

**UPDATE**



Damsels have been relocated to the 20g tank. Getting them out of the 75g was a task. So here's my next question... would it be advisable to add another (smaller) tang with my yellow one? (Possibly a Chevron Tang) I was told that if I did choose to add another one, the rockwork would need to be rearranged first. I was considering a tang mainly because of the nice growth of red gracillara in the fuge.

Yeah... that's what a friend of mine said. He advised at least a 90g if not a 120g.

The six-line wrasse is very nice, yes. However, I was considering a four-line, simply because just about everyone I personally know who is into this hobby has a six-line. I want something a little different. Is there any major difference between the two, or is it just appearances and price??