I you pm me your email I can give you a video of catching a fish in your aquarium. I watched it and built my own. Its alot like the one in your first post but the door is vertical. I caught my damsel in three days. It does require some DIY skills. Acrylic, power saw, acrylic glue, and fishing line. The good thing is you release the door on the fish you want to catch. The bad thing is you release the door.