Google DIY Walmart zen carbon filter I made two of them with the ducting and two 120 mm fans for under 60 I will post you the supplies that I used when I get home on my computer
For a cool tube you would just loose too much light with glass someone I know got ducting cut it in half and and put it onto of the bad boy hooked the two piece to the half with another ducting and sucked all the heat out that way
These are 4 gallon tubs one has happy frog soil and the other one is using fox farm Ocean forest the two others are getting donated to a friend if he wants them or donated to the trash