I HAD (past tense :( ) a betta, Dusk, who I swear is..er...was... 95% more fragile then any other betta I have. Sadly yesterday he had ich (I was not here for a couple days, so who knows when he got it) so I did a simple water change like I do with all the other bettas.... and this morning he was dead

I did everything like I always do... tap water conditioner, gravel siphon... -sighs-
Well, do any of you have one of those types of bettas? The ones who die(d) for the smallest little things? How exactly do you care for them?? >< The other bettas I have are fine... Though I think one other one who was in the same batch as him may be borderline of being more fragile than fragile