Horrifying 24 hours! (Lost 5 bettas and 1 gup) Was it the ich?

Tank is currently being treated with Nox Ich(Sodium Chloride, and malachite green are the only ingredients)
The ich treatment is working, So therefore i cant change the water for 1 more day.

I want you to keep in mind my other tank is undergoing Nox Ich treatment also and there is a betta in there that is very alive.

Parameters of tank with issues:
Nitrates: 20ppm (Safe)
Nitrites: 2ppm (Im assuming because of the dead fish)
(Im using seachem prime to detox the nitrites until i can change water tomorrow after ich treatment)
Hardness: Very hard 300ppm(this is normal for my area)
Chlorine: 0
Alkalinity: Basically 0? How did this happen???
Ph. 6.4
Tempature: 77 degrees constant
Tank Size: 29 gallons

Keep in mind there is still 10 healthy guppies and bottom feeders in this tank. If anything the bottomfeeders should have been the ones effected by the ICH treatment.
Help me get healthy again.

 

If your fish can take it and if it is ich gradually increase your water temp to 30c (86f) before a 30% water change and a repeat Ich treatment and another wc and ich treatment 48hrs later. The increased temp speeds up the ich lifecycle so that it is more likely for the medication to be present when the ich is in the free swimming stage. We're coming to the and of a week of similar treatment in a fully populated aquarium and all ok so far. Hope you do ok!
We found this useful

 

If your fish can take it and if it is ich gradually increase your water temp to 30c (86f) before a 30% water change and a repeat Ich treatment and another wc and ich treatment 48hrs later. The increased temp speeds up the ich lifecycle so that it is more likely for the medication to be present when the ich is in the free swimming stage. We're coming to the and of a week of similar treatment and all ok so far. Hope you do ok!
We found this useful

Are you filtering during treatment? I find it hard to not have a filter media in there for 3 days on end. But its what im doing.

 

This is where sponge filters and carbon-free filters shine. I remember a couple years ago when we treated my wife's platy tank for ich...had no carbon-free filters.....things got so NASTY and QUICK!!

 

Will baking soda raise my alkalinity?

 

Are you filtering during treatment? I find it hard to not have a filter media in there for 3 days on end. But its what im doing.

We don't run a carbon filter anyway - all our sponges a separate so we just don't use one. All the rest of the filtration is left in situ. We're using King British white spot treatment though which has no salt in it (it's malachite green, acrifavine and quinine.
Not sure what effect salt would have on the filter column.

Will baking soda raise my alkalinity?

Why baking soda?

 

We don't run a carbon filter anyway - all our sponges a separate so we just don't use one. All the rest of the filtration is left in situ. We're using King British white spot treatment though which has no salt in it (it's malachite green, acrifavine and quinine.
Not sure what effect salt would have on the filter column.

Why baking soda?

Its something people do apparently.

 

What about GH & KH readings?

 

What about GH & KH readings?

Listed at the top. GH is 300ppm and KH is 0 to nothing

 

Ick rarely kills quickly if fishes are established and healthy. No picture provided. Could be something other than ick.

 

Do your guppies have pink half moon shapes behind the gills?
0 kH, nitrites present, and no ammonia readings, I think it's possible you are running high ammonia. With no filter material (I think?) In you filter and no carbonate to help feed the bacteria, your tank is not cycled. You can cut the filter open and dump out the carbon, but you would still need to get the the kH up to feed the bacteria.

Yes baking soda (sodium bicarbonate) will raise the gH, it also unloads the free sodium (salinity increases) as the bond breaks down so it's something to be extremely cautious with. Especially in the presence of certain species or snails.