09-13-2011, 08:34 AM
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Yeah, I'm not surprised that fish didn't make it, but sorry to hear :(
I don't know a lot about parasites. I've not heard of any that would cause this type of massive internal bleeding, but like I said I just don't know much about them.
If they are jumping out of the tank a lot, the water level is too high. It's also possible that they are trying to escape if the water is harming them. It's important to acclimate fish to water changes. Your friend should be using a water conditioner to remove the harmful chlorine and chloramines in ANY water the fish will be swimming in, even if it's just for a few minutes during a water change. The water should also be the same temperature as the tank water or it can shock their systems. Some fish are jumpers, like bettas, but most fish shouldn't be leaping out of a tank all the time unless there is something wrong with the water they are swimming in.
Just a few thoughts to try to save the remaining fish.