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Hey everyone. I am new to the forum and joined because I am having an issue with 2 of my 7 comets. I have had my comets for almost 3 years and they are all over 10+ inches - not including the tail. 4 have short tails and 3 have fantails. 2 of the 3 fantails have sections of their tails that are stiff and on one the bottom of her tail is permanently rolled up in a tube shape. They all eat well and are given Hikari koi pellets, duck weed, shelled peas and worms from my compost from time to time. (the compost is maintained for my fish - I also keep Oscars and Severums). They are presently in a 180 gallon until I complete their pond (2000 litres - hopefully in the next 2 months or so). The tank is filtered by an undergravel filter...water changes are done every 2 days at 50% and the nitrates are always below 40. I have all of them since they were babies....2 of them I rescued from the feeder fish tank at my LFS...They have been well looked after and are otherwise very healthy. I have never had to treat any of them for any diseases. As they get older though I am noticing this thing happening with just these two fish. Could it be a hereditary defect? I would think if it was diet or the conditions I would be seeing it in more or all of the fish.??? Thanks Melody