You can try and make a fish trap using coke bottles or something similair, I also leave nets in my tank for ages when im trying to catch a fish sometimes I walk out and they're swimming past and I nab them.. Also I try and put food in the net and they swim in to get it, but its probably no help if your fish hide if you come into the room..
Also regarding breeding them, I would give it a go if I was you just for fun but wouldn't expect to get much more than $5-8 a fish when you sell them because they are only zebras