The Red Eye Tetra (Moenkhausia sanctaefilomenae) is a tropical community fish. The red eye tetra's hardiness and ease of care makes it an excellent beginner fish. This fish is readily available, peaceful, and is suitable for most community aquariums, although it is quite active and may disturb slower, more timid species. A word of caution-although generally peaceful, some individuals have been known to be fin nippers on rare occasions, even when kept in groups of 5 or more. The red eye tetra is a schooling fish and should be kept in groups of six or more, if kept alone it may nip the fins of other fish. The red eye tetra does best at temperatures of 72–79 °F in a planted tank with plenty of shoaling space. Red eyes tolerate a range of water conditions but prefer slightly soft, acid water.