When I was at the petstore today I found a "brine shrimp net" it has smaller holes in it to where its almost solid but its still netting, I didnt buy it because I dont move my fish enough to need it. But now I know where to go if I do.
I use a lil net scooper. and my ct fins are find. I guess because I treat them as though they were glass. Extra gentle. Also I let them just swim out net. I don't manuever it in water.