Hello all. I've only had this Koi Betta about 3 weeks. He looks fine and eats well. Tank is 4 weeks old. It was instant cycled with media from my 55. Parameters 0 Am, 0 Ni, 20-25 Na. The tank is dirted, sand capped. Thrive dosed once weekly. 78 degrees. He doesn't surf like this constantly but definitely does the majority of the time. Before jumping into getting cherry shrimp I'm currently trying ghost shrimp to be sure the tank is shrimp safe and the beta won't go after them. Put 8 ghosts in 12 days ago, I've plucked out 3 dead ones and none dead in the last 6 days. Chalking the deaths up to ghosts usually coming from poor conditions so usually aren't the healthiest when you first get them. Video below, would you be concerned or carry on as usual?