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I have a 15 gallon tank with 12 salt and pepper corydoras and 6 white cloud minnows, that's been up and running for 3 months, finished cycling 2 months ago. Yesterday I noticed my fish acting weird so I did a water test and it returned 8ppm ammonia, up from 0.25ppm 4 days ago, after which I did a 50% water change. I immediately did an 80% water change, got 0 ammonia readings. Also tested my tap water, which returned 0.25ppm ammonia. I tested the water this morning, 0.25ppm ammonia, did a 10% water change, 5 hours later I tested the water and it returned 4ppm!. What's going on? Quick answers: For the last 4 days I've been giving 1 catfish pellet and one small pinch of flake food, skipping two days. I fed one single catfish pellet before going to bed last night and haven't fed them since I don't think there is anything rotting in the tank, I haven't been able to count all 12 corydoras but I removed all of my plants and scape yesterday and didn't see any corpses. This doesn't rule out the possibility of one buried in the substrate. Last time I counted 12 was last week Doesn't appear to be a cycle crash; my ntirates are up 5ppm from 0ppm this morning Yes, it was cycled. Yes it has lots of plants, including anacharis I added 5ml of profito fertiliser within the last week I've been adding seachem with the water changes in order to keep the ammonia at bay but if anyone has any suggestions I am desperate. The "nuclear option" is to remove literally everything from the tank, put the sponge filter in a bag with tank water, drip acclimate the fish to fresh, dechlorinated tap water, and add everything back in.
Hi everyone! I hope your day goes well. I am a Nerm and thought I was doing pretty well. Have some ammonia issues with some new tanks. I think the gravel leached ammonia. At this point, I am checking everything! This am, checked my tap water., .5 ppm. Checked my top off bucket that had sat overnight - maybe 24 hours. Test went black green. Any advice or welcome. I have python but honestly don't like it. Another story. I guess I won't bother letting water stand to release chorine and simply always add Prime or similar. Another lesson in "Never Assume".