Hello everyone, I've bad my betta Theo for about 3 1/2 months now and he's been the spunkiest, healthiest little guy I think I've ever owned. Yesterday however, I noticed two concerning things: his slime coat seems to be shedding off in certain areas (back, gill area, and ventral fins), and his left ventral fin (where I've noticed most of the slime shedding) is splitting. It's been split since I bought him (you can see from my profile picture), but since it never worsened I ignored it and just figured clean water would do the trick. I originally blamed the slime on a hide I had added to the tank during his weekly water change on Tuesday. I noticed the slime on Friday, and so I removed the hide, did a substantial water change after, treated the water with StressCoat+, and added some Indian almond leaves. For the rest of the day, he seemed fine; a little disoriented perhaps, but fine. Today the slime has returned, so I'm convinced the hide was not at fault—it's definitely something with Theo. He's been hiding behind his heater a lot and he's been lurking towards the bottom more (it's rare, but it's not normal for him). I'm really worried about him. What could this be and what can I do for him? He's still readily eating, fully colored up, and responsive; he even feels well enough to flare and be grumpy, so I don't think he's feeling THAT bad. I just worry that perhaps this is the beginning stages of something really bad. Info: Ammonia - 0 ppm Nitrite - 0 ppm Nitrate - 0-5 ppm (because of the large water change yesterday, but I assure you the tank is fully cycled) pH - 6.4-6.6 Temp - 78F Tank size - 5G If you need any images of the tank, the hide, or anything else, please let me know and I'll post them. I just really want to get this figured out for my betta's (and my two others) safety. I don't have a picture of the slime right now because he produces it and it falls off when he swims around, but I'll be sure to get a picture of it when I notice it again. This picture isn't of my betta, but the slime coat shedding looks similar; note the "strings" of slime coming off.