Thanks for the reply. I wish I would have seen your response a little sooner. I had talked to the lady who I bought my male from, and she said cephalexin was the only antibiotic she uses on her horses. I went ahead and started the cephalexin. I've been using it for about 24 hours. The white patch looks a little smaller, and she ate two or three frozen mysis today as well. Not sure if the cephalexin has had anything to do with that, though. Can cephalexin can be used with triple sulpha? I know that triple sulpha can be used with some antibiotics, but I'm not sure if cephalexin is one of them.
One thing I'm still a little unclear on is the concentration of meds that stay in the aquarium. In other words, is the same amount of antibiotic going to be in the tank right after you add the medication and 24 hours after you have added it? I'm curious because I've been doing 50-75% water changes everyday (because there is no bacterial filter, so I'm trying to keep the ammonia down). So, after the water change, I then add the same percentage of med back in the water. I'm wondering, depending on when you do your water change, and when you add the daily dose of med, wouldn't this effect the concentration of the medication in the water that you need to replace? Or am I just overthinking this too much? I guess what I'm essentially asking is, does the concentration of the medication decrease the course of the day or does it stay constant, and we are just increading the amount of medication in the water with every day of treatment?