I'm with trashion on the feeder blocks. They're bad. They are food in a slow dissolving substance. You can't control the amount of food, the size of the food or the rate of dispensing. And if you aren't around to change water, you shouldn't be adding to waste in the tank, especially by an unknown amount in a dissolving solid that may affect your pH. Change water. Most likely the damage has already been done, and all you can do is keep the water clean and hope for the best. For the funny-swimming one, it could be worth trying the "pea-cure". Microwave some frozen peas, take off the skin and cut up little and feed to your fish. This is often helpful for fish that are having trouble passing something they ate.
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