Notes on Fishkeeping (Part 355): Tackling oily biofilm or surface scum

Generated by Gemini Notebook based on this blog post: https://www.kianmeng.org/2026/10/note... This diary-style entry from an aquarist chronicles an ongoing struggle with a persistent oily surface film that manual cleaning and partial water replacements failed to cure. The author outlines several experimental remedies, including increasing water movement via a sponge filter, adding aquatic plants, and introducing snails to naturally clear away the organic slick. Ultimately, the purpose of the text is to share practical troubleshooting methods and document trial-and-error solutions for managing stubborn tank impurities.