sorry for your loss.. those are great tigs.. it really is a pain to see those beautiful tigs go and for having them for so long...

at first when i saw the first one with the bump i though maybe it had bump it's head too much on something. infection.. is out of the line since their was no puss.. did it smell bad though? on the second one.. it needs some investigation on it. here are the question you can follow and see maybe something went wrong:
What was the last food?
was the last food the same as the first one and the second one?
did both fish live in one tank?
if yes maybe their is something in the tank or water?
when was your last w/c?
anything new you added in the tank?
anything new outside the house (environment-chemical sprays or whatsoever)?
any meds, additives...?
it's really hard to think what went wrong.. since they are fish and we can't analyze them the way humans are.
sorry for your loss
if i were you i would take the 3rd tig and put it on a new treated water with established filter. might as well try it rather than have another problem.
