One of my Betta Boys slowed down his activity level and started hanging out by the water surface. He was juvenile in March, looks like maybe fully grown now. Have have him for 2 months, in his own 2.5 gal cycled, filtered, heated, heavily planted tank. All water parameters are ok except for Ammonia it was 0.25 yesterday, did water change. Can't see any visible signs of illness on him (spots or anything) and he eats his food. This has been going on for 2 days now, I had apple snail and couple of ghost shrimp in there with him and took the snail out after reading one of the posts on this forum last night about their bioload. Aquarius (that's his name) went crazy looking for him (the snail) he made endless circles checking out all the hidding places, the plants and everything. I know he was looking for the snail. Then we went to bed, then this am..... Sitting at the surface again! I'm worried about him. Does anyone out there have any ideas of what maybe wrong with him? I know hanging close to the surface maybe due to issues with damaged gills from ammonia to help them breathe, but ammonia in this tank has never been higher then 0.25, I thought this was not enough to cause any permanent damage in fish, is that not true? And how can I help him other then good care which he's been getting. I hope someone out there chimes in with some tips for me. Thank you