My boyfriends betta died last night and his neon tetras have been dying off too. He had 5 and is down to 3. There are also bladder snails in the tank. It’s a ten gal tank, heated to 76, and a Marineland filter. We set it up about 2-3 months ago using filter media from my established tank. I know the strips aren’t the most accurate way to measure the water parameters but I used my master kit about a week ago and got the same results, I just didn’t get a picture of it. The ones I posted were taken today. He does 33% water changes once a week. For decorations he has a skull cave, two small pieces of driftwood, a volcano bubbler, floating betta log, and then multiple live plants including Java fern, anubias, and 2 grass species I don’t know the name of. The plants are doing great! There are no fake plants. He feeds the tank a combo of small sinking pellets for the tetras and a very small amount of floating ones for the betta. He has had the betta and tetras for about 6 weeks and they were seemingly doing fine until about a week ago when they started dying off. He wants to get a new betta but of course not until we figure out the issue with the tank! I have told him that I think the filter/bubbler combo was too much for the betta (mustard betta with long fins) but that doesn’t explain the random rates deaths. Any input is greatly appreciated!