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How well do they do in a community tank with: 2 pearl gouramis 3in, 1 fire dwarf gourami 2in and 3 lamp eyed tetras in a 20 gallon. The knife im looking at if 5in. I know they are nocturnal and eat small fish sometimes but how small. AND.. how hard is it to have natural plants in a tank? I have a aqua-glo flor light that is supost to help plant groth. I would like to know the best looking plants for the best price. ??? ???