Just purchased a new Wet/Dry filter (Eshopps) have hoses, pump and bio balls. etc. (everything needed) I have never owned or set one up. The instructions I received are very poor, so I need help setting this bad boy up. I currently have a 300 gallon ( not drilled) and was planning on setting it up with overflow box. Please don't tell me to drill tank as I am not doing so. Thanks in advance.