Black round tail Paradise fish (Macropodus ocellatus ) 80 mm 80x30cms for a pair (minimum size tank requirement). Temp 3-20 degrees celcius. pH: 6.0 – 7.5 Hardness: 90 – 357 ppm, Bubble nesters, males are generally larger and more colourful becoming more aggressive when breeding it has been known to breed them in ponds (preferably not with goldfish/carp ect). Difficult to locate in aquatic shops (UK) but not unheard of. Can grow to 70-80 mm. So exotic, unusual. Not suitable for beginners.