i have an idea. take a short butter tub with a 1.5 inch hole on the bottom. then tie something small that floats to the rim. itll float so fish can go into it. u should add some weights to the bottom to let it fit under the hood.
The floating plastic plants work great my fish love swimming in and out of them. THe only thing that kinda stinks is that food gets stuck on the and sometimes the fish cant find all the food.