i have been entertaining this idea:

i have a plastic rectangular flowerpot that measures about 8-10 inches long, 3 inches deep and 3 inches wide.i would like to put plants in gravel in and make a frame for it that allows it to hang inside the tank on the back in between my two filters. i could use plastic or insulated wire to fabricate the hanging frame. or better yet maybe i could use 3-4 inch pots and plastic cup holders that hang on car doors! either way heres my question:

what kind of house plants would be possible candidates for such an application? (keep in mind the fact that i want to use a plant with thick foliage to help combat nitrates as well as look apealing) one plant that comes to mind is the ones that are commonly sold with bettas-in-a-jar setups. what are those called?

They're called peace lilies.

I'm not sure if they do well in aquariums though.

ive got a 10 gallon fish tank that i keep a 11 inch water snake in. i siliconed a 3 inch high divider into it. it separates the dry side of the tank from the wet side. in the wet side i have feeder guppies, gravel and a 3 inch flowerpot w/peace lily.theres also some sort of ivy type plant growing over to the dry side from the pot as well.
both plants are growing/thriving very well. because i havent seen any adverse effects in the guppies, i may go ahead and try it out in my 35 gallon with the hanging pot method that i mentioned previously.
ive got pictures that i will post within the next couple of days. i will keep everyone posted on whether or not this idea does well or not. if anybody has any reasons why i shouldnt try this, post me back and tell me why. i dont want anything to happen to my goldies.

well, i went ahead and bought a peace lily in a 6 inch pot. i also bought a couple of 4 inch pots for transplanting. i went to an auto parts store and bought 2 plastic cup holders that hang from a car door. the cup holders were designed to hang too low for my application. so i grabbed a lighter and heated the hook on top of the cupholder and bent it to the shape that i needed. basically, i shortened the hanging depth to the point that the pot that sits inside has its rim about 1/2 inch from the water surface. the rest of the pot hangs down in the tank. i took the lily out of the pot and washed all of the soil and perlite from the roots. it helps to have a bucket of water and to massage the roots to get rid of the soil/perlite. once all of the dirt was removed, i pried apart sections of the cluster into two or three clusters. i then placed large gravel chunks in the bottom of a 4 inch pot to cover the holes some. then i took one cluster of lilies and cut excess roots off the bottom. once the cluster was pruned (roots), i placed it into the pot and backfilled with medium/small gravel from my tank. once i completed the transplanting, i slid the pots (2) into their own modified cupholders and mounted them in between my 2 waterfall type filters on the back of my tank. they are about 1 foot tall and jut out of the top of my tank about 6-8 inches. they look sooooo good!!

if anybody else would like to try this, there are many different ways to go about mounting a hanging planter on the back of your tank. one simple way is to poke a couple of holes in a pot and make hooks out of coat hangers to hang it from. im sure you can come up with many more ways, as well.

p.s. i will post pics as soon as i can borrow my buddies camera and crunch the pics to 60k.