The Red Sea Sailfin will eventually grow into a very large fish, so unless you're planning to upgrade, I would NOT be adding another tang or angel into this system. I've seen these fish in my friends' tanks and they were dessert plate size & bigger. They also seem to be one of the faster growing tangs commonly kept by aquarists.
If you do add another fish/tang for algae control, look at the bristlemouths (like Kole tang), since they stay reasonably small and are constantly grazing algae in their natural environment. If the hair algae is bad, get a sea hare, as already advised.
The other thing to consider is that with 2 tangs already in the 120g, and hair algae present, this seems to indicate that your nutrient levels are elevated and feeding the hair algae faster than the tangs can eat or your skimmer/water changes can keep up with. Adding another good sized fish will only ascerbate the problem, IMO.
How big a sump & skimmer do you have on this system?
I have a 4' 120g with a 90g sump/seahorse refugium that is heavily stocked, but its got a skimmer rated for 250g so no hair algae, especially not in the display tank.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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