Am I doing something wrong?

[SierraMoonbeam]

My last two bettas have both died because of this white, fluffy fungus. I kept them in a gallon tank, and their water was about 80 degrees all the time.

Is this just a crazy coincidence or am I not caring for my fish correctly?

Please help me out.

[Cody]

Was this filtered? How often did you change your water?

[SierraMoonbeam]

It wasn't filtered. I used distilled water and I changed it every couple weeks.

[JMeenen]

Never use distilled water for fish or plant or don't drink it yourself...It has a very low ph

[Neo]

every couple of weeks???? read the sticky about caring for a fish before you try again, routine water changes(not full) every other day or so, read and study before trying again

[Neo]

ive never seen or heard of a white fluffy fungus, did you clean ur tank with something linty?? sounds like lint??? just thinking out loud

[smadi278]

From what I understand you're supposed to use a conditioner with distilled water. They come in either liquid or pill form. But distilled water alone will kill your fish!

[JMeenen]

it sure will

[Flashygrrl]

Why distilled anyways? Too much junk in your tap water for them?

[Oldman47]

In most places water that is good enough to drink is fine for most fish. It will need dechlorinating before you use it but chemically it is superior to distilled water. If you have extremely hard tap water, you might want to dilute it with distilled or RO water but most tap water is not hard enough to need it.
Distilled has a pH of 7.0 but not for long in a fish tank. As soon as it starts seeing a fish load it starts going down. Because it has no minerals to buffer the pH, it will drop very quickly which is one of the things about distilled that makes it tough on fish.