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General Body Form:
As with the other Melanotaenia species, the body is rounded, and the fins and tail are not remarkable in size or shape.
This is a peaceful schooling fish. They should be kept in schools of 5 or more. And should have a ratio of 2 or more females per male if possible. The ideal aquarium should include a cover of rocks, driftwood and live plants. Rainbowfish in general need nice clean water, M. lacustris is no exception. Provide them with a well filtered tank with good current and aeration and they will thrive. When water conditions are sub-optimal this fish is prone to developing columnaris, and a condition of columnaris that we call “threading.” You will see wisps of what looks like string or hair hanging off of the mouth or sides of the fish. This is a sure sign that the water conditions are sub-optimal and performing extra water changes will clear it right up.
Fisbase - Lacustris
Rainbowfish, A Complete Pet Owner's Manual by Gunther Schmida
Baensch Aquarium Atlas 3, Second English Edition 1998
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