I have a 10 gallon divided tank with two male bettas. One is perfectly fine, one is sick. The tank is going through a mini cycle I believe. Readings are ammonia .5, nitrites 0, nitrates 10. Guava, the sick fish, has not been able to eat his food in the last week or so. He grabs at the pellets but can't seem to catch them. He has to try really hard to get bloodworms or shrimp (freezedried) but does manage. He can get flakes somewhat easier. I did a water change yesterday, about 75%. He seemed ok until this morning when I went in to feed them and he did not attempt to eat. He was just slowly spinning in circles. I went to work for the day and checked when I got home. He is still just spinning slowly. I don't see any visible signs of illness other than the fact that he can't seem to open his mouth for food. There are no patches of white anywhere, I can't see any red on him that is noticeable. He was a pretty happy fish as far as I could tell, he liked building bubble nests. Just wondering if there is anything I can do for him on top of water changes and using Prime. I have some maracyn and maracyn two but I don't want to use it blindly. Any suggestions?