The 4 172a are in a 40B along with the 018 to quarantine them all together. They are all about 3-1/2". I was away for a few days shortly after I received them and when I got home I noticed that the 172a were clearly covered in what I initially thought may be ick, but I noticed the dotting was more yellow. All 4 were in the front on and around the sponge filter. The 018 seems to be unaffected as of now with no dots. After some quick research here, it appears to be either velvet or chilonodella. I have attached a pic below for those of you with greater experience to give your thoughts. From what I've read, Proform-C seems to be a popular choice here for battling the aforementioned diseases. I don't have any on hand, but ordered it from Amazon today in hopes that I get it before it's too late. In the meantime last night, I did a 60% water change while stirring the pool sand real well and vacuuming. I also added Metro and Prazi as I felt that they were mild enough to at least offer some treatment. I also raised the temp up from about 82 to 85.5F from last night until now.
The tank, which was well established with a small group of Madagascan cichlids that were moved out a few days prior, is filtered by an AC70 and large air driven sponge which I cranked the air supply up to for more bubbling and O2 exchange. I also added a powerhead near the surface for the same reason. My parameters stay rock steady as I am on a well with a pH of 7.8, KH of about 4 degrees and GH of about 9 degrees. Ammonia and Nitrite are 0 as they should be, with nitrate at or below about 30ppm. Other than river rocks, a few ceramic pleco caves, and a water logged piece of driftwood, there are no other decorations in the tank. I should also note that the source water where the fish came from was a pH of 8 with similar hardness numbers.
Any other advice in regards to treatment or diagnosis is greatly appreciated!
![Image](https://i.imgur.com/3MkuBv1.jpg)