I have an Edge tank from Fluval and with that small opening it's darn near impossible to catch them with a net. I took a small plastic water bottle,cut in about half, drilled a hole in the cap,and shoved the cap end back into the other half. I put a little bit of food in it first and then sink the bottle. It works great, just keep an eye on it, you don't want to leave it in there to long once it starts filling up with shrimp.
Jimbo
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