We have the larger version of this:The goldfish bowl with the magnet? My. Issue is i have a 125, theyre only 18" deep and between rock and coral :/ ill see what kind of space i have tmrw i have the sliding door trap currently, its bulky.
https://www.tankmatez.com/collections/all/products/tankmatez-ez-bubble-fish-trap
It worked very well the 2 times we used it. You are right though that it is bulky, a little unweildly and does require some space in the tank. The release mechanism adds about 2 inches to the distance the globe sits in the tank.