Do I need Aerator, and if so, how big?

[addy1]

Sissy the one I picked up worked great, I ran 3 air disc's and two air stones off of it without any issues. Must have been a tuesday when they built the one I bought.

 

[sissy]

Mine never worked that great from the beginning and even contaacted the sellar on E-bay and nothing and had to contact E-bay itself and they resolved some of it .They did reverse some of the money so I only ended up paying 23 dollars but the sellar was not happen because I wanted to send it back ,but figured something was better than nothing .I have not bought anything from E-bay since .Left a bad taste in my mouth for them ,don't want to blame them but ,I will be lots more carefull from now on