Very glad you are looking for a bigger tank. He will be much happier, trust me!
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Do you use tap water?I clean the filter using a hose & compressed air.
Were you still doing daily water changes? Ammonia shouldn't be creeping up at this point, not if the tank is established and you're doing daily water changes. @EllRog @Ch4rlie @essjay ?
OP, can you tell us what filter you're using, and how you clean it please?
The way you've been getting ammonia readings since the end of last month though, and still today, makes me suspect chronic water quality issues are taking their toll in the poor thing. Ammonia poisoning is no joke, and it would account for his symptoms. When ammonia has continued to return, he hasn't even had a chance to recover, and it's possible that the damage done is just too extensive.
I had a few readings at zero, so I reverted to weekly water changes. Should I continue to perform daily water changes regardless of the water parameters? Here is the filter that I'm using.
I clean the filter using a hose & compressed air.
@SpotiKona the fin rot is almost incidental at this point. The biggest problem with your betta is that your tank isn't cycled. Cleaning the filter with tap water has been killing any all or at least a good portion of the nitrifying bacteria we need in our tanks to keep the tank water safe, which explains why you keep getting rising ammonia levels, and likely nitrite too.
@SpotiKona the fin rot is almost incidental at this point. The biggest problem with your betta is that your tank isn't cycled. Cleaning the filter with tap water has been killing any all or at least a good portion of the nitrifying bacteria we need in our tanks to keep the tank water safe, which explains why you keep getting rising ammonia levels, and likely nitrite too.
Your fish is suffering badly from this. Ammonia literally burns their gills and skin, causes all sorts of damage, as do nitrites. Never clean the filter with tap water, always use old tank water that you've removed to just swish the filter media around in to remove the worst of the muck. We're not aiming for spotless here. The main thing we want the filter media to do is grow colonies of nitrifying bacteria. One type of bacteria 'eats' ammonia and converts it to nitrites, the other type of bacteria 'eats' nitrites and converts them to the much less dangerous nitrate. High nitrate levels aren't good for fish either, but we keep those levels low by doing water changes.
Right now, you need to be doing daily water changes to keep your fish safe. There has to be zero ammonia and zero nitrites whenever you do a test, anytime they're above zero, you need to do a 75% water change. Don't touch the filter for now, leave it alone.
The look of his fins isn't the main thing. Chances are, if he can still recover from the ammonia poisoning, that handling this will also fix the fin issue. But worrying about the fins right now is like worrying about the wallpaper while the house is on fire, know what I mean?
His condition isn't a mystery, it's ammonia poisoning.
When there is a PH drop like that, it usually signifies that there was a spike in something else, which I believe was your ammoniaThanks for all the suggestions! I did measure the pH again last night. It still read 6.0. However, after the 80% water change, pH increased to 6.8. Ammonia levels have also improved today; the new reading is about 0.25 parts per million. I will continue to change his water daily until the reading stabilizes at zero. Any thoughts about the slime on his coat? It does seem a bit better after the water change. To answer a few questions, I am using API Stress Coat+ to condition the water after changes. To test the water, I am using the API Freshwater Master Test Kit. I'm a bit worried though as he's still at the bottom of the tank breathing heavily & not interested in any food.