Way back when...I had a newt terrarium and used a canastar filter. It took a only a little bit of work to clean out the thing once a month. I am just trying a wat to purify the water. My sump works great, but I would like to have something more.

What would you suggest to add in the canister as far as filter media? Also, what canisters would you recomend for the 100 dollar range?