Alright, how do you filter one of those rubbermaid tub ponds? I'm going to be using a tub that we have around the house for storage, so it can't have holes cut into it, and I'm a broke college student, so it won't be pretty. I'm thinking a maximum of $25 for this project, if possible.

the reason for this idea is that I will be taking my fish home for thanksgiving and christmas breaks (well, maybe not thanksgiving...they can manage a week with an automatic feeder), and I don't want to cart home a 30 gallon tank. Any ideas?

just buy a filter for fish tanks, it is a 30 gallon right?

no, what I'm talking about is I need a filter for the RUBBERMAID tub...NOT for the aquarium. can I just use the 320 gph power filter from my fish tank for the tub? I know it'll be a bit underpowered, but if I do regular water changes, it should be okay for a month, right?

it will be alright how big is the tub anyways, just treat the tub like a regular tank

I would guess 40-50 gallons...

then buy a filter for 40 -50 gallons (400-500 gph)