Fin rot can be the result of a bacterial infection (Pseudomonas fluorescens, which causes a ragged rotting of the fin), or as a fungal infection (which rots the fin more evenly and is more likely to produce a white 'edge').
A possible solution is to focus on simple community systems under controlled laboratory conditions, for example microbial communities consisting of Escherichia coli or Pseudomonas fluorescens and their bacteriophages.
Pseudomonas aeruginosa | Pseudomonas | Pseudomonas syringae | Pseudomonas fluorescens | Pseudomonas putida |