my 20 is pretty tall. also i have the partial canopy that my lighting goes on top of giving me the same height as a 55 gallon. so i think i got the height covered. going to take some planning i know that. thinking like a bunch of crypts in the water since thats the shortest plant i have had luck with. but not sure what plants to do on the surface that likes having it's feet constantly wet. also i'm going to have to use a different filtration system as the hob filter on it now will not work obviously. if anyone has any ideas feel free.