Every now and again one neon is swimming around the tank vertical. With his tail in the air and his head down. Swimming up and down about 1cm at a time but around the tank. Is this some kind of weird mating dance or is something wrong. This only happens about once a week or so. Any info would be great. Thanks
guppies, platys, catfish, neons, Danios and a shark! And the guppies are multiplying! I would still like one different looking colourful type of fish - not sure what yet though and a few Kuhli loaches.