New hill stream loach died after adding med trio

[a tired fish keeper]

I bought some fish on Monday.one of these. Fish was a hill stream loach i wares until Tuesday to add the meds     (I used the aquarium co op med trio) it side to look very good after adding the meds but I hoped that it would bounce back but this morning I found it dead any idea about what happened.

[Zac]

On 5/11/2022 at 6:59 AM, a tired fish keeper said:

I bought some fish on Monday.one of these. Fish was a hill stream loach i wares until Tuesday to add the meds     (I used the aquarium co op med trio) it side to look very good after adding the meds but I hoped that it would bounce back but this morning I found it dead any idea about what happened.

How was it acting before the meds were added? I doubt the trio had anything to do with it 

[a tired fish keeper]

It was swimming around jut fine cling onto to the terra-cotta pots I have in the tank it as also fairly darkly colored  but a short period after I added the meds it’s coloration got fairly pale and it looked like it was having trouble holding on to surfaces. Also all the other fish where/are just fine nothing even slightly suspicious