Why are my fishies dying?

[BigQFan]

Here's the deal....I just dirted my 29 gallon, well established tank. After rehoused all my fish all that was left was 5 dwarf neon rainbows. After a few days of all tests being good, I brought home a 6th rainbow. A few days later that one died. Then 2 of my older neons died. The only thing that seems off with my parameters is it appears I have 0 nitrates. Ammonia and nitrites are zero as well.
If it helps to know this is a moderately planted tank

 

[Mebbid]

Did you use organic soil? It is likely that there was some sort of additive that has been leeching in your tank from the soil and took a while to build up. I've seen copper in some fertilizers and soils so that is a possibility.

 

[BigQFan]

I used what everyone talks about...Miracle Gro Organic blah blah blah. I dirted my 20long about a month to 6 weeks earlier and everybody was fine

 

[Mumma.of.two]

Is it possible the 6th rainbow brought in some type of disease?

 

[BigQFan]

I suppose it's possible, I considered it myself, but i hate to think that cuz I bought from a very reputable LFS

 

[Voshon247]

I suppose it's possible, I considered it myself, but i hate to think that cuz I bought from a very reputable LFS

Mistakes can happen after all we Are all human

 

[BigQFan]

So, lets assume it is a disease that was brought into tank. I have only 2 rainbows in tank and one pleco. Do I just do daily water changes for the next few weeks?

 

[Voshon247]

Look for any suspicious sighns and I guess water changes would be the best for now

 

[Mebbid]

Are there any outward signs that the remaining fish are sick? If not then water changes would be the right direction to go.

 

[BigQFan]

Everybody else seems healthy and happy, as far as I can tell anyway.