i have a female swordtail who's tail is rather tattered. i noticed it a week or two ago and have been keeping an eye on her. it has not gotten any worse and i haven't seen anyone other than the male swordtail bothering her, but he doesn't seem to be biting her or anything, just nudging her occasionally. i noticed yesterday that she is also looking skinny. i'm in the process of setting up a hospital tank for her, so i can monitor her more closely. i'm wondering what people think i should do.
pH: 7.6ish (that annoying area at the top of the standard pH test and the bottom of the high range one, making it hard to read accurately)
nitrate between 10 and 20 before water changes (i can't tell the difference on the card, i'm thinking about looking for a different kit where there is more color change)
temp: 74 (recently reduced from 78, realized none of my fish need it that warm)
tank mates: 1 common pleco, one male sword tail, one other female swordtail, 9 tiger barbs (i have watched and none of the barbs have been bothering her)
water changes: at least 20% once a week (thinking i'm going to have to up this with my nitrates being a little high)
feeding: aqueon tropical flakes twice a day five days a week, algae disks (for pleco) once a day, zucchini once a week
nothing has been added in over a month.
i don't think there is anything else i haven't covered. if you need any more information, let me know. she is being removed from the 29 gal to a 10 gal hospital tank once the temp in that one is up to where it needs to be.