ive added it back without the top piece, the salt creep was a bit excessive. and aeration is necessary.Here's the deal.
You can do lots of stuff without using the proper steps. You can paint a room without primer first. Close DOES count with hand grenades. You don't *have* to quarantine fish... But just because you can, and can successfully I might add, doesn't mean it's BETTER than doing things right.
Skimmers do a lot more than just clean the water. I would argue using a skimmer and just leaving the cap off so it doesn't actually skim would have a huge positive impact on your tank.
EDIT: i replaced some piece in the skimmer that made it not work, its working again.