Screwed up pretty good

So, I got a bunch of free fish, and setup a 5 gallon (guppies and platys) to QT them. I have a bunch of whisper 10's, so to setup the new QT tank I just took the filter out of my 5 gallon betta tank to seed the new filter media. I'm glad I setup a QT, because it turns out the fish have a parasite problem.

I noticed over the past week that my normally very docile betta (who doesnt even eat guppy babies) has been chasing the pygmies around. He has a tumor on his side that has not progressed much since it appeared. It doesn't seem to affect him thus far, so I haven't looked too much into treating it. He's remained healthy and happy. today I looked up at the tank (its on top of my desk) and noticed that he suddenly has dropsy.

AGH!

You know what I did? I forgot to put a filter back into the FREAKING FILTER BOX. And now the one that was in there has been sitting in a tank with parasites for weeks. I seem to be missing a pygmy, as well.

Needless to say, I did large water change, put filter media in, and seeded it from one of my healthy tanks. But COME ON.

Everyone makes mistakes, is it just ich or something else?

It's not ich that I can tell. I've never had ich in my home, so I don't think it's that. I think it's just some general illness do to being in an unfiltered tank for two weeks. Water change made him a bit perkier already.

That sucks. I hope they all make it.

I've had plenty of screw ups myself.

I hope your betta will be okay. I haven't dealt with it much, but the couple of times I've seen it, it didn't turn out well.