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Temperature affects treatment and life cycle of ich. Temperature decreases oxygen content of the water as you raise it. It doesn't affect the medication. Medication will also reduce amount of...

DO you have a planted tank? Plants will eat ammonium before nitrates.

You will always see nitrates if ammonia drop to 0ppm is due to bacteria.

Watch the nitrite test for 5 minutes. Do not leave it. When nitrites are really high, it will change to the highest...

If you figure out who the culprit is, then you need to physically separate them from each other.

Sounds like it's being attacked from a specific direction.

I would considering upgrading that tank in the future to at least twice that size for those 2 goldfish.

What other tankmates are in the tank? New fish can bring in unwanted pathogenic bacteria, hence the need to quarantine for a few weeks to months.

Fish don't experience depression. Shoaling fish...

The fish added enough organic matter from fish waste to produce a heterotrophic bacteria bloom. Do a larger water change 50%, and add an airstone. Do not feed for several days.

How large is this...

I use Seachem Paraguard for possible ich carriers for about 2 weeks at full dosage (Even with ancient and scaleless fish). I haven't seen any difference in stress in a QT or final aquarium. The...

Ammonia is best measured below 2ppm, since the test is unreliable when it gets closer to 4ppm. Toxic ammonia will affect the cycle if it goes too high. At a PH of 8.0, it won't take that much. ...

Please post with a youtube link. I'm getting warning signs from your previous tapatalk.com link

Your tank is ready for the stocking and timeline you proposed. I would get nitrates down to less than 20ppm with water changes right before you purchase the cories. Test the ammonia and nitrites...

Okay so your tank can't handle all the 1ppm ammonia yet. But, smaller fish don't put out that much ammonia in one shot in a 40g tank.

Add in enough ammonia for 0.5ppm, or half your 1ppm dosage...

If you do a water change, you can bring your tank water PH up as well as the KH (buffering capacity) that is naturally removed slowly during cyling. The amount a PH goes up is not linear so doing a...

Did you test the tap water after it has been sitting out for 24 hours in a cup? That will give you the most accurate PH reading.

At your low PH, the bacteria colony doesn't work as well as those with a PH above 7.2. Hence, the ammonia reading 2 months later. But don't worry, the API Ammonia test reads total ammonia, meaning...

That is protein film due to organics in the aquarium. I would siphon the surface by having the siphon tube under water and pointed at a 45 degree angle up so that only the surface of the water is...

That's a measure of ph and not hardness GH

shoaling behavior happens in the presence of predators or nervousness. The fact that the CB spread out is an indication that they feel safe, and want to get as far away as possible from other CB in...

1 weeks worth of cloudiness is definitely a sign of having too little population of heterotrophic bacteria, and too much nutrients in the water column.

Find the ingredients on the root tabs. I'm pretty sure the calcium/mineral build up is from something you introduced to the tank recently (excel, root tabs, etc.)

The cloudiness is the result...

If it's a hard bump, it's possibly a tumor/

There are a lot of fish (not just goldfish) that do well in the 50F-84F, and some actually require the lower temperature for longevity. Of course you would have to stock less.

UPS won't last very long with heaters. Would only be used for filters or air pumps.

I see you have a bubbler, why not just add another one in the dead spot using a T connector? That's much cheaper modification than adding and then removing a powerhead in case you don't like it.