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Don't know if it would work or not but I'd try and leave the net in the tank for a few days hoping he gets accustomed to it. After a few days try and snare him then.
As mentioned the thirty will be fine as long as it fits in the stand. Would recommend against using ccoral as substrate in this tank if you plan on keeping corals.
Well the first thing you should do is move it away from the side glass to allow you to clean it when necessary. Probably good to do it now while everything is all worked up. Also, with the pieces in the tank I can see where it can make for a nice looking scape.
Like I said in an earlier post above, I can speak about the two I have. My Sailfin and Yellow get along fine and for the most part the thought is you get two that have different body types/shapes and you should be ok. Good luck.
Here are a couple of sites that provide descriptions and pics of the different Tangs. It might help you in your research. LiveAquaria.com, saltwaterfish.com, and FantasyReef. You can also look at here
My 2 cents. Don't buy because someone has a sale or because it's all they have. Do the research and purchase the fish you want otherwise in the future you will wish you purchased that other fish and will be stuck with the one you purchased instead.
Personally for one I think the tank will be too small for the Tang. The fish you've listed I would add the six-Line last and the Goby first. I cannot provide a vendor from which to purchase.