Dang, we just threw one of those out recently. I used a Dole fruit cup. It works ok, but I would have liked a lower profile. The lid didn't fit as snug as I would have liked, so that took some work to correct too.
Did you use a regular net? It looks like a brine shrimp net. I tried that... and I might as well have poured the shrimp in the tank. They went right through it. I'm trying pantyhose next, hopefully the shrimp will be ready before lights-out tonight.