Hi everyone, I am new to this forum. I have two guppies in a 5 gallon tank. Two days ago I noticed that one of them has this abnormal transparent line across one of his gills, and I can see the red color inside through the line. I attached a picture, it's not very clear but you can see a line on the gill just below the eye on the right. I don't know what has happened. Some background:
I have had them for 2 months and they have both been doing very well. The other tank resident is a kuhli loach. Last week the tank went through a mini cycle with up to 1ppm ammonia and 3ppm nitrite, but I dosed stability and prime every day for a week and did WC
every other day, and after stopping stability for a couple for days, ammonia and nitrite are down to <0.05, nitrate is 5ppm. So, this could be from poisoning. In addition, two days ago one of the guppies jumped out of the tank onto a plastic plate (don't know which one it was because it wasn't me who picked him up), and he could have injured himself as well. It's been two days, it does not seem to get better or worse. He eats well and is very active. I am waiting for my Seachem Stress Guard to come in but it will take 2-3 more days, but I am worried he could get infection before then.
I was wondering if anyone has seen something like this, and is there something I should do now before I receive Stress Guard. Thank you in advance!
P.S. the tranparent line looks like he lost some shiny coat on the gill, but he is very active so it is really hard for me to look at the gill carefully and see if there is anything else on there (like rotting).