Don't worry, getting all of this info at once is a lot. When it comes to disease treatment,
@Humblefish has seriously great write ups on them. Here is one for ich.
https://www.reef2reef.com/threads/ich-cryptocaryon-irritans.191226/
That being said, I am not convinced you have ich, or at least I have not seen a post (I could have easily missed it).
If you have any doubts, search for his posts, he practically has one for every disease out there. He recommends what can be simultaneously dosed, etc.
Outside of maybe missing a post, here is what I believe is going on, and it aligns with
@Seawitch.
1) Bacterial Infection (This is what the BiFuran will treat)
2) Cycling a new tank
The most fundamental part of reef keeping is the nitrogen cycle. Let me explain on a basic level below, it is actually commonly misunderstood and there are some incorrect myths about it.
Any waste in your tank (uneaten food, fish poop, etc.) breaks down and releases ammonia. Ammonia is commonly misunderstood in the US because most tests here measure TAN which is short for total ammonia nitrogen. Basically this is a mix of ammonia (toxic, for real) and ammonium (not really bad in our example). An exception is the SeaChem Ammonia Alert, which actually measures just ammonia, which is why I recommend it for tanks in the first few months. Beneficial bacteria that live on the surfaces of the tank (rock, mostly) break down the ammonia into nitrites. Nitrites are then broken down even more into Nitrates. Nitrates are relatively unharmful to fish in the concentrations we normally see. Nitrates are then exported via water changes, or used as nutrients by corals, etc.
In your new tank, the food and fish waste are building up ammonia, but unfortunately, you do not have the beneficial bacteria to break down this waste. Cycling is the process where a tank builds up this bacteria, most commonly before the fish are added (there are some alternative ways). This is why I recommended Dr. Tim's One and Only earlier, this is basically a bottle full of the bacteria to jump start the process. Will it be enough to get you through, that is a questions I cannot answer and is case by case.
Another bandaid for the problem is a product like API Ammolock or Seachem Prime. These products basically bind up the ammonia for about 24 hours so they are not toxic. They DO NOT get rid of the ammonia. They simply make it non-toxic so you fish can live until the ammonia is exported. This might be a good bandaid to keep the fish healthy and stress free, but it is not a substitution for a proper nitrogen cycle.
I would recommend getting 2 bottles of Dr. Tim's. Shake the first one up and dump it all in. Use the second one to dose a capful daily to keep the population growing. I cycled my tank in a different manner and I am using 3 different bottles bacteria products to help boost the population.
Now, This is where it gets a little complex and out of my league. Simultaneously dosing the Rid-Ich, BiFuran, Beneficial Bacteria, and Ammonia Detoxifier might have some conflicts.
As Seawitch stated, the meds will knock out your beneficial bacteria, so now it is even more of an uphill battle. I do not know the extent and damage it will do to the bacteria, but it sure is not helping.
I know that is a lot of info at once. My recommendation is to choose one topic that we have discussed at a time, handle that issue, then move on to the next. A smooth and methodical approach will get you through this!
