| Jaguar catfish Synodontis schoutedeni |  |
| Jewel cichlid Hemichromis bimaculatus |  |
| Jewel rainbowfish Melanotaenia trifasciata |  |
| Johanni Mbuna Melanochromis johanni |  |
| Jordanella floridae American flagfish |  |
| Julidochromis marlieri |  |
| Julidochromis ornatus Golden Julie |  |
Too many fish? Overstocked tanks stress the fish in many ways: competition for food and space, bullying from other fish, deterioration of water quality and increased concentration of disease vectors. A lightly stocked tank will always be easier to care for, with more stable water quality