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You can probably pick up an aerator at Walmart, Kmart or Wallgreens.
As far a changing water, I picked up a relatively inexpensive aqaurium filter that can handle up to 10 gallons and hangs on the back of or attach inside a bucket. It has a hanging clip and suction cups. It's a Whisper microfilter, and runs about $15.00 and does a good job of keeping the water clean.
I have 2 five gallon buckets that I use for shiners during the winter, and I also have an old trash barrel, about 10 gallons, that I fill with tap water and let sit for at least 24 hours to allow the chlorine to leach out. I've had shiners last for almost a month just by keeping tabs on the water and the filter.
My ultimate goal is to get a decent size circular tub about at least a foot deep that will allow the sjiners more swimming room.
Don't forget to feed them every other day or so, so that they can keep up their strength. I just crush up some goldfish flakes really fine and give them about 1/2 teaspoon worth.
If they don't eat it all, you'll just need to keep track of the water quality and the filter.
I hope this helps.
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