Currently we have wonderful, fully grown specimens of the Threadfin Rainbowfish in stock. Like a butterfly its wings the male Threadfin Rainbowfish flaps its first dorsal fin during courtship. The males can be easily recognized by the long filaments of the second dorsal and the anal fin. The tender species attains a maximum length of about 5 cm.
There is hardly another aquarium fish as peaceful as this one. One must never keep I. werneri in company with rough behaviour, the Threadfin Rainbowfish will not survive under such conditions. In respect of water chemistry the Threadfin Rainbowfish is flexible. It thrives well in a pH of 5.5 to around 8.0 (BUT: be very careful when adopting the fish to new conditions, it is extremely sensitive against sudden changes!) and soft to medium hard water. The water temperature should be slightly higher than usual, about 25-29°C. But the most important factor is the correct feeding. These fish have a very small mouth. Food particles must be small, too! Best is living brine shrimp nauplii, but I. werneri feeds also on very fine dry food, micro, vinegar worms, rotatoria, cyclops (this can be frosted, too), etc.
Who is willing to fulfil the demands of that fish and also adds some peat, alder cones, or dead leaves in the tank will be rewarded by beautiful and fascinating looks.
For our customers: the fish have code 421704 on our stocklist. Please note that we exclusively supply the wholesale trade.
Text & photos: Frank Schäfer