This is a hang on Dymax skimmer operating with one pump outside the tank, and the other inside the tank for better skimmer performance. See pictures
I am using it for my 4ft tank which is super effective.
Selling skimmer together with the 2 pumps at $150.
Sms 98471699
Lights come with 2 separate switches, with each switch controlling 2 tubes.
Selling at $150.
Note the original 2 white tubes were never used and brand new, since I have changed that to the 2 Marine Glo blue tubes.
Sms 98471699 if keen