First and foremost I hope everyone is staying safe and healthy through these times. I'm not new here I've posted before when I first started. I'm not a newb but my all means I'm not advanced or super knowledgeable. Trail and error. It seems all my fish are sick except my Cories. They all flash after water changes and every now and then. I observe them as close as I can amd I dont see and ich. I'm assuming some type of parasite. The thing is none of my fish swim. I have 2 male 3 spot gouramis 5 emerald Cories 5 albino Cories 2 veil angelfish and 8 tiger barbs. My barbs stay at the bottom most of the time huddled together in front of the anubias. The barbs almost never come to the top to eat anymore. One gourami stays behind the filter intake while the other gourami stays at the bottom behind the driftwood. My Angel's are fine. They all eat but it's weird. Weird meaning it's almost like they are scared. The Angel's eat fine. Another thing I've had my gouramis for almost the life of the tank at least a year and half and they are very scared. I cant come to the tank without them thrashing like I'm trying to kill them. I love my fish and it's really bothering me. Can someone please help. I apologize if I put this in the wrong spot. Ammonia 0 nitrite 0 nitrates 5-10. Temp 76. Please dont make fun of my plants lol. They are new. Heres a few pictures.