If you have a small tank, two nets works best. If you have like a 30 gallon or higher, a huge net(like 10inches) works great. The net is so big, the fish dont see it comming, if you move in slow, and usually dash right into it.
Of course this usually doesn't apple to loaches and my false SAE, these little pains will not be caught, unless you remove most of the tank decorations....as I found out.