| Debauwi catfish, Three-striped glass catfish., African glass catfish Pareutropius debauwi |  |
| Denisons Flying Fox Puntius denisoni |  |
| Discus Symphysodon aequifasciatus |  |
| Dolly pleco, L183 Ancistrus dolichopterus | |
| Dwarf Cory, Pygmy catfish Corydoras hastatus | |
| Dwarf Gourami Colisa lalia | |
| Dwarf Pleco Peckoltia pulcher | |
| Dwarf Rasbora, Spotted Rasbora Rasbora maculata | |
| Dwarf african mouthbrooder Pseudocrenilabrus nicholsi |  |
| Dwarf livebearer, Mosquito fish Heterandria formosa | |
| Dwarf neon rainbowfish Melanotaenia praecox |  |
| Dwarf pencil fish Nannostomus marginatus |  |
| Dwarf puffer fish Carinotetraodon travancoricus |  |
| Dwarf sucker catfish, Midget suckermouth catfish, Oto Otocinclus affinis | |
| Dermogenys pusillus Half-beak |  |
| Distichodus sexfasciatus Clown tetra | |
The biggest killer of tropical fish is overfeeding. Uneaten food decays and pollutes the water, even with adequate filtration. Adult fish should remain unfed one day each week, and almost all commonly available species will be completely fine if unfed during a two week vacation