What do you mean cut the corners of the ziploc?I took a small glass vase, cut the corners of a zip lock bag and sunk it into the vase. I rolled the sides over the top of the base and secured it down with one of my hair bands. I put the vase in the tank and let it just sit for a day so he could get used to it. Then I let the wrasse go hungry for about a day and only added food into the trap. If he wanted to eat, he was going to have to swim inside it. I sat and waited for him to swim in then quickly grabbed the vase out before he had a chance to figure out how to swim out of it.