I wanted to start watercrest seeds or duckweed in fish tank but fish would end up just eating it. This was the forth attempt that I finally like and it does work well, small duckweed was added for picture since my order of seeds is in mail yet. I seen ideas of clip on the side style but I don't like that concept. This could possibly be used to isolate a fish if you need to. The bottom area is 7"x3" so it can fit a fair amount of seeds, I printed with 8% gyroid infill so air would be trapped in top brim. It does sit a little above water so it should keep fish out. Support was just on build plate for brim, if you click support everywhere it will build in holes on sides which is not needed. This is not going to support any non floating plants, and is not it's intended purpose. So far it is doing exactly what I wanted and I am fairly new to this so I hope it works for others as well.