http://seriouslyfish.com/species/Pseudomugil-furcatus/
Water Conditions
Temperature: The air and water temperatures in its natural habitats do not vary a great deal and in aquaria the fish tend to fare poorly unless maintained within the range
24 – 28 °C.
pH:
7.0 – 8.0
Hardness:
268 – 536 ppm
Behaviour and Compatibility
Peaceful and suitable for well-chosen
community aquaria alongside fishes of comparable size, disposition, and requirements with many cyprinids, gobiids, eleotrids, and smaller melanotaeniids suitable.
The eleotrid
Tateurndina ocellicauda, with which it occurs in nature, is particularly appropriate.
P. furcatus is a shoaling
species and should be kept in a group of at least 8-10 specimens.
Maintaining it in such numbers will not only make the fish less nervous but result in a more effective, natural-looking display.
Males will also display their best colours and some fascinating behaviour as they compete with one other for female attention.