Ok, before I start, I'm on my phone because my computer is broken. Remus is my first betta, but not my first fish. He's in a cycled 10 gallon (not planted yet but he has a marimo). Last night he seems to have lost a scale doing who knows what. He's highly active and swims like a crazy person when he sees me. I'll do a test on all his in tank decor, but how worried should I be about the missing scale? This was the only pic I could get of him holding still. There was some fin damage near the top from moving ( the friend I adopted him from says he swam under a rock as she was moving it ) but it's already growing back, the black edge is his coloring. He's a butterfly betta. The external filter has a very weak intake. I keep his tank at 78-80, and the pH is normal. He's still relatively small.
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Also, I'm new here and there is probably a better way to post but ill figure it out as I go. My phone doesn't like this format very much.