I really hate to make posts that have obvious answers, I really try my very best to do all the research I can, but I just can't figure out this dilemma.
I bought this twintail male betta fish on the 16th, he was doing fine for a long time; I had him in my 30G with my albino bristlenose pleco, 6 corys, 4 mystery snails, and 6 shrimp, he was happy, healthy, and not aggressive towards any of his tank mates, though I did see him try to munch on a bladder snail, but I digress. He has recently been clamping his fins, and is very lethargic. I tested the water parameters; ammonia 0ppm, nitrite 0ppm, nitrates 5ppm. I'm pretty sure it's not Velvet, as I've taken pictures with the tank lights off and a flashlight, but there is no iridescent glow on him, but he does have a lot of the symptoms of Velvet.
I've separated him into a 5.5 gallon. I'm doing daily water changes and dosing aquarium salt, his fins aren't as clamped anymore, but he is still just as lethargic. Any information is helpful. Thank you :)
[April 26th - Healthy Pierrot]
[April 29th - Unhealthy Pierrot] + [pictures (they are bad quality though)]