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If you are putting stuff in the tank (food, ferts, top ups) you need to be taking stuff out of the tank (via water changes). You can muck about trying to narrow down what specific thing is causing the deaths but it would be easier just to get on and do some water changes. I would start off smallish so as not to shock the fish as having been left you tank water maybe very different to your tap now. Something like 20% a day for a few days and then up it to a few 50%. Then keep up biggish regular changes for at least a few weeks. If no more deaths then you can think about reducing it slightly, but not altogether.
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