Well, the tank is 10 gallons, has been set up for a little bit over a year now, but i changed species about 5-7 days ago to platies. Here's my results:
Ammonia:0ppm Nitrite:0ppm Nitrate:28ppm pH:7.5 It's OK isn't it?
Also got 3 corydoras, but they are doing fine with the other platies
I have also noticed that his tail instead of being opened wide like the others it's closed and when he swims, he moves his whole back body instead of just moving the fin...