I have a 10 gal tank that houses 3 neon tetras, 2 fan tailed goldfish, 1 placostamous and a floating nursery with 5 guppy fry. I had the water tested 4 days ago and it showed it was slightly high with nitrite. I purchased and planted 2 plants in the tank the same day (hornwort, I belive). Now for the last 2 days my goldfish have been holding tight to the bottom of the tank. Are they sick? If so is there anything that I can do to save them or make them more comfortable?? Any suggestions are greatfully appreciated. Thanks everyone!