Last night while at wal-mart I was studying three different types of aerators, scratching my head wondering the differences. So, I held off the purchase and decided to ask here first. The first aerator was a yellow box about 4" tall 2" wide, it cost $6 and some change. The second aerator was all sold out, but, it was called the "deluxe aerator", it cost around $9. The third aerator was at a different location (it was with the boat supplies) it is a white box and called "minnow aerator" (I think?) it has a picture of little fish w/ bubbles on it. ($6) The thing about the white aerator it actually states that it will run for 33 1/2 hours, and will oxygenate up to 7 1/2 gallons. (The other two didn't have this info. listed on the box) So, which of the three is the best? Any suggestions?