i have a 75 gallon tank that i have got off of a guy that i know. when i got it there was a 75 gallon wet dry system with protein skimmer built in. i have up graded to a refug and have them running inline ( two diffrent tanks with bulkhead conectiong them) for about a little over a mouth now. would it be time to take the wet dry out or leave it. also i would betaking the protean skimmer out if i take the wet dry so i then would have to go and get a diff protein skimmer right ? not sure what to do any com and questions will help thanks. jeremy