OK, my suggestions.
Do a weekly water change of 60-70% of the tank volume. Use a good conditioner, I use API Tap Water Conditioner because it is effective and you use very little. You could use Prime, at least for now, though with no ammonia, nitrite or nitrate in the tap water this is still not the answer. These are occurring within the tank, and that is what you want to rectify.
Don't use the Colony stuff. Some of these have been known to increase ammonia.
Monitor ammonia and nitrates. You want the nitrates down below 20 ppm. During water changes, use the changer to poke into the substrate and remove as much of the mulm/detritus as you can. Also rinse the filter media, if you have a filter with removable media.
Feed sparingly.
Try to pin down the GH of your water supply. Check the website of the water authority, or call them. Get the number and the unit of measurement so we can work this out. This is not the ammonia/nitrate issue, but it does impact fish and that means additional stress which only makes other issues more of an issue.
Do a weekly water change of 60-70% of the tank volume. Use a good conditioner, I use API Tap Water Conditioner because it is effective and you use very little. You could use Prime, at least for now, though with no ammonia, nitrite or nitrate in the tap water this is still not the answer. These are occurring within the tank, and that is what you want to rectify.
Don't use the Colony stuff. Some of these have been known to increase ammonia.
Monitor ammonia and nitrates. You want the nitrates down below 20 ppm. During water changes, use the changer to poke into the substrate and remove as much of the mulm/detritus as you can. Also rinse the filter media, if you have a filter with removable media.
Feed sparingly.
Try to pin down the GH of your water supply. Check the website of the water authority, or call them. Get the number and the unit of measurement so we can work this out. This is not the ammonia/nitrate issue, but it does impact fish and that means additional stress which only makes other issues more of an issue.