Effect of frequent water changing on Betta and Ideal ph level for my tank

[Gaston]

Hi,
can someone help please?

last week my fish tank was affected by poor water condition (very high nitrite and ammonia) and I lost 3 neon tetras, 1 ottocinclus over 4 days period(1 per day).
I had started 30% water change on daily basis from day 1, when my ottocinclus died.
on the day 5 my Betta fish died when the ammonia and nitrite level were under control. So I would like to understand the reason why my Betta died when the water condition improved, was it due to frequent water changes?
What is the ideal PH level for 46 litre tank to keep the betta fish.

I will appreciate your help.

cheers,
Gaston

[SinX7]

Did you use any water conditioner?

[aokashi]

imagine a person just about to die because he is freezing. just because you found him and brought him into a warm room doesnt neccessarily mean he will make it.... probably the same with your betta. net time this happens, I recommend an immediate 90% WC. 30 is too little really.

[Gaston]

Originally Posted by SinX7

Did you use any water conditioner?

Yes, everytime I do the water change, i put the water conditioner.

[Gaston]

Thanks lesson learnt...I miss my betta, he was lovely and very friendly to me.

[SinX7]

Get a adjustable heater next time :p You don't want this to happen again.

[babystarz]

Bettas are very tolerant of a wide pH range. Anything from 6-8.5 is just fine, and I'm sure there's a little wiggle room on either end of that.