i have a ph test kit. but ive only had the fish in there for about a week. i havent done a water change yet, i was going to do it about every two weeks. my water treatment that i used removes ammonia. im going to probably do a 25% water change tomorrow though
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The water treatment removes the ammonia that's present in the tap water, if there's any (excess may remove a bit more left over, but it would take huge amounts to counteract fish waste). However, the ammonia the fish procue has to be converted to nitrIte, and then to relatively harmless nitrAte by a bacterial colony that grows in your filter. This colony can take 4-6 weeks to establish. Again, review the article I linked, as the cycle and water quality monitoring/control are really the only "thing" to keeping fish. The rest of it at some level boils down to dumping stuff into water.
pH is one of the least important stats to monitor for most fish, though it is good to watch as it should be kept stable (adjustment usually isn't necessary or advisable).
Ammonia and nitrIte are critical to monitor, especially in a new tank. Any amount over 0 is bad, and calls for a 20% water change. Any value over 0.25 is very bad, and calls for an immediate large water change. Anything over 0.5 is panic levels, and may require several large water changes spaced out over a few hours to bring down. The same rule applies to nitrIte, but nitrAte is relatively harmless. There will usually be some present in a mature tank, and it's only toxic in large amounts. Weekly water changes (again, in a mature tank where ammonia and nitrite are always 0) will usually keep it in the 10-40 range, which is perfectly fine except for some sensitive fish that don't like levels above 20.