The Fire Red Dwarf Gourami (Trichogaster lalius) is a popular bright red colour variation of the classic dwarf gourami. Minimum Tank Size: 10 Gallons Maximum Fish Size: 2 inches Water Temperature: 73F to 82F Ideal pH: 6.5 - 7.0 Water Hardness: 4 - 10 dGH Temperament: Generally Peaceful Top-Swimmer. May be aggressive towards other gourami in a too-small aquarium. Unless experienced with fish-in cycling, we always suggest cycling an aquarium BEFORE adding fish. Adding fish to a fresh, un-cycled aquarium can kill them rapidly. We offer free water testing at our physical location, and advice via email or call.