CompatibilityENG Fish
The document is a compatibility matrix created by Gerald Bassler for freshwater aquarium hobbyists. It lists a wide range of fish groups (e.g., Malawi cichlids, Tanganyika cichlids, New World cichlids, scalars, barbs, bettas, corydoras, danios, discus, gouramis, guppies, mollies, tetras, etc.) and indicates, for each pairwise combination, whether they are compatible (J), not compatible (N), or uncertain (O). The chart also includes categories for larger predators, bottom‑dwelling species, brackish/pond fish, and plants. The legend explains the symbols, and the table is intended as a quick reference for planning community tanks, helping aquarists avoid aggressive or incompatible mixes and understand where uncertainty remains.
Topics
Legend and Symbol System for Compatibility Assessment
Explanation of the three symbols—J (Compatibel), N (Niet compatibel), O (Onzeker)—used throughout the matrix to denote compatibility status.
Structure and Symbolism of the Compatibility Matrix
Explanation of the table layout, column/row headings, and the meaning of the J/N/O symbols used to denote compatibility.