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  1. J

    How many cardinal tetras would be needed for them to feel safe and confident among 6 corydoras?

    Hello guys, first aquarium I have ever done. I cycled it for 16 weeks and used fish food to get it going, until 3ppm ammonia (dr tims) was fully gone in 24 hours. Tank size is 125l with six corys and five cardinal tetras. It was supposed to have been 6 tetras but one was already dead in the bag...