For a start, you can consider changing your filter media. If there are particulated matter, there are two things you need to take note..
01. Poor water circulation in your tank. Look for suspended particles, they are a good indication of dead spots.
02. Change your filter media setup to include fine filtration media. There are fine filter wool that you can cut to size if Juwel does not stock what you need.
Without good water circulation and the correct filter media, the Eheim 2026 will not solve the problem you indicated either.
Hope that helps.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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