iv got to get 2 of my bettas out of their little betta bowls and into better homes. i want to divide a 5.5 gallon in half. how can i do that effectively and economically? to be honest this will be a long term investment so it doesnt even have to be that cheap it just has to be worth it. and preferably, id like to be able to remove it later so i can go back to using the full tank if i ever need to. 
