ClockworkCatfish

So. I decided to test this. I took a bowl of tapwater, squirted in maybe 10/20mls of Dr tims ammonium chloride, at the end of the test it was light green, 10 minutes later it was black. I added more ammonium chloride, waited for a while for it all to diffuse (also swirling it around), retested, after 5 minutes it was a lighter green than the previous test, 5 minutes later it is turquoise. I will be ordering another test kit as soon as my replacement debit card arrives. Will be periodically adding prime until then.

I haven't added any anti bacterials and the cycle is definitely still going on, I briefly removed all ornaments to check for corpses and found none

I only took the plants and scape out for 20 minutes, to allow me to see if there was anything rotting behind driftwood, sponge filter and substrate stayed in the tank.

M My understanding is that seachem prime gives false readings inasmuch as the bound ammonia can still react with the salicylate test. That ammonia is still there, just in a non harmful form, and the ammonia being there in the first place is still troublesome.

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.