Hỏi về cá dĩa tự nhiên ốm lạ thường

Tình hình là bầy dĩa nhà mình, đang ăn uống bình thường, đột nhiên có vài con ốm lại, nhưng vẫn ăn đều đều, mình vệ sinh hồ cá trung bình 3 ngày 1 lần, mỗi lần 50-80% nước.
Thức ăn là tim bò, trùn huyết và tetra.
Mình dùng lọc tràn vách trong hồ, 5 lớp bông lọc, nước hồ rất trong
Không hiểu sao cá ốm, mà vẫn ăn, nhưng chỉ vài con ốm thôi, nhìn mà xót.
Mấy con còn lại vẫn ăn khỏe, mập mạp.
Các cao nhân cho mình xin ý kiến và tư vấn giúp ạ!

 

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