I have a 4-5 inch comet GF with 2 smaller shubunkins living in a 100 gallon kiddie pool for the winter. It has a pump/filter that will go in the pond also. I have been trying to deal with ammonia levels of .25 without any luck. I have done weekly 25% water changes, tried a filter sponge that would supposedly "suck up the ammonia", have added the "good bacteria", and have now started with ammolock. Well, my comet has a discolored area (pea sized) on each gill cover. They are cream/gray colored with darker brown areas blotched within them. I'm trying to figure out if they are ulcers maybe from the ammonia? Friday I started a .3% salt solution and I haven't noticed any changes. Last night he didn't come readily for his food and looked slightly less active and tended to stay by himself more. I'm worried when I get home today he might be dead. Because he's in a kiddie pool it's hard to get a picture from the side to post. My other water quality #'s are OK. Any suggestions about what this might be? The other 2 fish look OK. A couple of weeks ago one of them had a small "bubble" on one of his gill covers which is now gone. I also have a new pump with mechanical, biological, and UV filtration in it since thursday.

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