Sorry to say but time will not take out those bubbles. Also, using filter material will result in more maintenance.
The only four options that pop into my little brain are,
1. Quick & Dirty method- Bucket(a) in a bucket(b.) Bucket-a has an outlet near the top and bucket-b has an outlet near the bottom opposite the pump side of the sump. Takes up a lot space in the sump though.
2. Drain the sump and silicon in some glass baffles.
3. Houdini in some pre-made acrylic baffles.
4. Use a diy acrylic baffle box insert that just drops into the sump under the pipes coming from the tank. Thats what I did since my sump is an irregular shaped plastic tub and also did not want to shut down the system. The drawback is the cost of materials is more then option 1-3.
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