a shrimp tank would be neat, but if that doesnt work out maybe you could make make a nice planted tank with a small group of the blacklight tetras...they would be a wow tank during the night with the glow they have...and since they are barelly an inch they should be ok for 3 or 4...it owuld be tight quarters but they are schooling fish

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Bullheads represent the cookie monsters of the rivers around here...hungry, hungry, hungry