Need help with percision marine bullet one

[MattL22]

I have a pm bullet one skimmer set up about 3 weeks can't get it set right to collect dark scimate right now it's collecting a greenish skimate
How can I set it to work better how often does the inside chamber need to be cleaned
Thanks for your help

 

[MattL22]

Nobody has this skimmer

 

[mufret]

Which pump are you using with the skimmer? ANy pics of it setup?