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Your photos were plenty clear enough, don't worry. To my eye, it is rather obviously ich. And, while providing info on your setup and water parameters is important, in this case it isn't necessarily needed for a diagnosis and your setup would most likely have not been the cause of the ich anyway. Because you got these fish very recently, they almost certainly came with it from the fish shop. In general, it's best to avoid getting fish from any tank that has any signs of disease, even if the fish you want appear fine.Both tanks do have plant substrates I use fluval bio stratum and both tanks are very new (about a week for the one with the small fish and 2-3 for the betta) but they were cycled with old media and dosed with quick start. All the water was dechlorinated and any heavy metals were removed. Today I did a water change (probably close to 15%) with a small cleaning of the gravel I also have shrimp but they had to be removed because of medications. All of the ammonia, nitrate, and nitrite levels were super low, basically 0’s across the board, but my pH was a bit lower than I would have liked as well (probably low 7 maybe even high 6’s) both a new filter with pretty good flow that I have at a water level where the water flows across the top for lots of surface agitation and they have activated charcoal in them. Because the tanks are so new I did not clean the filters. I just noticed that these fish had an off color today during cleaning and the small black ones I got 2 days ago and the betta got sick after I added guppies from the same store 2 days ago. They are from a local fish store that has been very trustworthy up to this point. I also had a half dose (one tablespoon per 10 gallons instead of 1 tbsp per 5 gallons) in both of those aquarium prior to seeing any illness to help prevent it. Tomorrow I will measure water parameters again and have more exact measurement rather than what I can remember from earlier and clearer imagery of the fish hopefully.
Did you recently do a water change and the water was colder than the tank temperature, or did you not properly temperature acclimate the fish to a new tank? I am just wondering how the outbreak got started.You can see his fins are a bit torn he is a rescue that I have had for close to a month now
Not only does this fish have a serious case of ich, his "torn fins" are likely fin rot. If they were really just simple tears, they would have healed in the month you've had him. The telltale sign of fin rot in bettas is that it looks like the fins are melting, which they definitely do here. There are dozens and dozens of "cures" for fin rot that are marketed for bettas and most of them are useless garbage. Fin rot is an external bacterial infection and you have a couple options for treatment:You can see his fins are a bit torn he is a rescue that I have had for close to a month now