Just tried to post this and it didnt work so i will try again. In a brand new tank, about 5 days old, I have 8 neon tetras and 10 neocaridina shrimp. last night when I went to check on the before bed, the tetras were all breathing very fast, some were breathing at the very top of the tank, and one appeared to have lost his blue stripe, although that may just be how he was born and I didn't notice. The other tetras all have vibrant colors. The shrimp are doing fine. After some reasearch, it looks like it could be a problem with water parameters, a disease, of a problem with dissolved oxygen in the water. My parameters, are o nitrate and nitrite, 50-60 kh, ph of about 7. The one that is really high is the gh, which is at 150 or maybe even higher. For the oxygenation, i have a water coming from higher up that would splash into the tank. however about 2 days ago it start running along the wall and dripping in at the bottom instead of falling in, which could have led to an oxygen deficiency. i fixed the waterfall yesterday night. When I came to check on them this morning, they were all breathing fast but none were at the top breathing like yesterday. Im not sure if not enough oxygen has entered the tank or if thats not the problem. They show no signs of disease other than the one with little to no blue stripe but he's also the smallest one in the group so he could just be the runt. They could also be really stressed, but I dont know what from. Parameters have been steady and there have been no temperature changes. Update: just found one sitting on a rock that doesnt seem to be breathing. idk what the problem is and really need some help.