Yes the ammonia can be slightly elevated after feeding. Like others have said keep water parameters good and everything should be fine.I have pimafix and melafix but wanted to avoid using them ....will up the thw wc's though.
Would feeding fish about an hour before testing alter water tests? I just tested and have small amount of ammonia and 0 nitrite 5 ppm of nitrate. Also tested the tap and it came up with 0 ammonia kView attachment 1016610
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