Do what Leo said. Don't use the well water untill you know what is in it. Go get some distilled or R/O water to use.

and what you got there is starting root rot but it is cyano-bacteria most likely from your well water. hell you can get it in public water systems.

I would clean it all up real good and start with neew ones if I could.
if you see this again run to the pet store and get E.M. ERYTHOMYCIN ANTI-BACTERIAL FISH MEDICATION. mix it as it says for the amount of water.. you could do this now if you have no choices.