question for those of you who use those tank dividers (ex: Lee's). i have a 5 gal (rectangular like the regular average 10 gal) that i'm going to need to divide. i know i could probably rig up a homemade divider, but i want to be sure its one the fish won't get around but i also need it to be removable should i want to use the tank for something else in the future. so i'm wondering about these tank dividers. they look to be made of plastic for the most part. do you all think they'd be pretty easy to shorten/cut down to fit the height/width of my 5 gal?