The problem is that u are doing way tooooo much. Add more filtration and air. Keep the temp at 84 85 , thats it. Add some salt so u get a specific gravity of around 1.004 ot so. That is with a hydrometer. Parasites take a good hit to get rid of them. Do water changes at least once every 2 or 3 days. U can use ro water or tap, just make sure its consistent. It really should be more towards, the 7.0 line so the young fish benefits from the minerals in the water and make sure they are all the same size. Even a fish thats and inch or so bigget immits a hormone that will stunt the sm ones. Look it up if u dont believe me. Forget live food, use frozen so no parasites or bacterial infection happen. Discus need great water, consistent parameters and clean sterile food. Good luck
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