Molly

The Sphenops or Short-finned molly is a smaller fish than its cousins the Sailfin mollies (Poecilia velifera and latipinna) and as their name suggests, the males do not possess a high dorsal fin. There has been a degree of hybridisation but pure sphenops are hardy, adaptable fishes that are great at control blue-green algae growth in planted aquaria. Even ‘pure’ sphenops may be a bit of a mix, thanks to the existence of close relatives that weren’t distinguished until after aquarium forms were established.