Not sure of your ammonia test but it sounds pretty high. I would do a 30% water change every day til it reads 0. Next, I would try getting the water quality back before treating with anything else. The pH crash + the ammonia spike could have triggered the ich again so I would go ahead an treat though only treat for 1 thing at a time. If they are eating, and the floating looks more like a bouyancy issue, I would try feeding a few crushed pea's. Not sure why it works but it does...some think it helps get the air bubble moving but there's no real proof, just that it does work. The main thing is water quality.
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Good Luck &
Best Fishes
