I recently bought 4 kuhli loaches, 2 black and 2 normal. I bought one of the normal kuhlis 6 days ago, I was planning to buy more but they only had one left in stock who was still quite small. I bought it and left my phone number for the store to call me when they get more in stock. I had also been looking at a different aquarium shop online who also sold kuhli loaches a lot cheaper, but there were also out of stock. This aquarium shop is quite far away but also pretty big and popular. A few days ago I checked the website and they had the loaches back in stock. Yesterday (Saturday 14th) I went and bought one normal kuhli and two black ones. I have them in my 45-50 litre tank with my betta, who is very docile. This morning when I turned on the light, they all scurried away except Nelson, the kuhli that I have had the longest. He started panicking and darting all around the tank and up and down the glass. I turn of the light in the hopes that it might settle him but it didn’t help and he’s been swimming around and panicking for almost 6 hours. Any idea what could have caused this or what I could to to help? I have separated the betta in case that is what’s stressing him but I have seen him swimming around and foraging with the betta right next to him so I don’t think that’s the problem.