I have had guppies, and a suckerfish and they keep dieing but they don't just die they float to the top and fight their way down and float back up! I don't understand why they do this. If anyone knows please help...
One of the most common reason for fish dying is because of water temperature. Maybe the guppies need the water in your fish tank to be warmer or colder, same with the sucker fish. Also, maybe you aren't feeding them enough. I bet the first reason is why though. Next time you get a pet fish, ask the pet store clerk about the suggested water temperature. =D
Fish keep dieing? 
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