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neon tetra deaths

  1. Noobster Fish Keeper

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    Just joined, so hi to all! My first aquarium setup went well for the first 3 weeks but now my neon tetra seem to be dying! I have a 90 litre tank with internal filter, heater and led overhead lighting. The substrate is fine white sand and pea gravel. The tank is planted with 5 different plants...
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