Adding chemicals to your tank is very rarely going to help your fish.
NExt time someting is wrong just start doing water changes with clean
SW, as large a percentage change as possible at a time. Until you have
asked here (or somewhere else that usually gives reliable info, (not the
LFS)) just stick to changing water. A lot of times this is your only
option anyway.
I'm sorry if I came off wrong but I just wanted to stress the importance
of not adding medications except as a very last resort, and even then
more than one source should recomend the treatment and explain why it
will help and the side effects of the particular products use.
I have not added more than Kalk and Baking soda to my tank for many many
years and change maybe
50% of my water per year. I found dosing some of this and some of that
made the levels of what I test go all over the shop.
Since throwing all the useless additives and medications out my tank has
gone ahead really well.
There us no magic cures, some look attractive short term but in the long
run it's the cause of the problem that needs to be addressed not the effect.
Simon

Rick wrote:

YW. You have definitely done more harm than good. I dont think so?

The medication will not effect the Bio filteration system. I had no
ammonia spike 0%

Ask first next time, it's probably too late to do anything about it
now

1.To late to do what? Whats anything?

2.If you had an infestation of Ich and a severe bacterial infection
and lost 90% of fish in your tank within a couple of days. What would
you have done different?

The fish all look healthy swiming/eating and then all of a sudden they
die the within days of each other one by one.