I got these tadpoles a couple weeks ago, but am not sure what they are. One of them got really bloated and can only float upside down. The pictures of the single tadpole are of the bloated one, the last picture is of two of the other regular ones. I have six, the rest of them aren't bloated at all. I don't have a proper fish tank for them, but I change their water every other day with sink water that I set out two days in advance so the chlorine evaporates. I also put a rock in the water for them to cling on to or climb up on when their legs get bigger. I separated the sick one and didn't give it any food. Is there anything I can do to help it?





