I use 10g tanks, and found that I can use a double sponge filter as a prop to hold up the lid without it slipping. Works like a charm!
I also have a round deep pocket shrimp net with a telescopic handle. Best I've ever owned.
And yes, it takes a while. Especially with Malawa. Those suckers have the fastest tail flip of any shrimp I own thus far! Not fun netting them on shipping days!