So we've had our reef tank for almost a year now and we've had mixed success with fish. I'd say about half the fish we've purchased have died within the first two months of us having them. We got a pair of clownfish from Live Aquaria shortly after our tank finished cycling. They died a few weeks apart from each other after a few weeks. They were SUPER tiny when we got them. We started going to Tropic Isle in Framingham after that and got two clownfish from them who we still have that seem to be doing great. We also got a purple tang about 6 months ago who is also doing great. But those are the only three fish that have done well. We're on our second royal gramma. We picked up a flame angel and potters angel about a month ago from Tropic Isle. Seemed like they were both doing well and then they both died Sunday. Checked all the tank parameters, ammonia, nitrites, and nitrates are all at 0. Also checked for copper just to be safe which was also at 0. pH has been stable around 8.1, we're doing a three day blackout because we have a lot of brown algae so pH dipped to 7.8 at one point but that's not much of a swing. Every time we lose a fish we check all the water parameters and they always come back normal. So yay for the tank being stable but it means we have no idea what caused the fish to die which is more than a little frustrating. They never show any signs of being sick and will be swimming around and eating just fine, then we wake up the next morning to a dead fish : / Any thoughts or suggestions?