I would try and use a larger tank. 10g is too small, I would get as large of a tank as you can fit in your stand - the larger the better.
As far as fragging goes, I've had my tank up for about 4-5 months, and it's my first saltwater tank. I've already fragged a couple of my corals a couple times successfully, don't think I've had any frags die yet other than maybe a mushroom piece that floated off into who knows where.
It's pretty simple, mushrooms you just cut off the rock and net to another and wait for them to attach. Polyps you just remove some polyps and stick them to another rock. I'm nto sure about SPS and some LPS... buuut, when I got my candy coral I fragged it before I put it in my tank. I didn't mean too, but I dropped it and it broke in too - now both halves are thriving and much bigger each than the original was overall.
Just search for fragging - you'll find some stuff. It's a great way to get cheap corals - just bring a frag to a LFS and swap it for another one :yes: .
Your' leathers might help to even out the colors once they cheer up. How long have they been in your tank?