Last couple of days I noticed my ammonia spiked. My tank has been cycled for about a month or so. I've been doing 50% PWC starting yesterday when I noticed the ammonia. Before wc it reads .25 and after it still reads .25. -.- Other readings are as follows: Nitrite: 0ppm Nitrates: 0ppm* pH: 7.4 Slightly alkaline and hard water. None of my other tanks are having problems so it's not the water or the test kit. I use API master kit (*also have yet to get a nitrate reading on anything. . . maybe I'm not smacking the bottles hard enough?). Head count checks out with 3 mollies, 5 cherry barbs (was going to up them to 8 on Tuesday but not happening until I get the water resolved), 4 adf, 2 mysteries, and about 10 or so ghost shrimp. Tank is planted and my filter is a tetra whisper 40i. I'm planning on putting a sponge filter in there too in the near future. The only thing that's changed lately is I trimmed my hornwort and removed the trimmings to try and get them to grow faster via natural sun light. I've put them back today in hopes it'll help. No one seems stressed or otherwise bothered by the ammonia; no prolonged gasping at the surface, no lethargy, no pink gills, no loss of appetite, etc. Aside from the daily 50% water changes, I've also cut back on feeding. Today is also their fasting day. What else, if anything, can I do to get the ammonia levels back to zero?