Just putting this out there (both for the OP and for others): while you can in fact insta-cycle a tank and add fish that same day without issues using BioSpira (like the individual did in the thread I’ve linked below*) or similar bottle-bac products (such as Fritz Turbo Start 900), you do need to be quite cautious in how you do so. It sounds like in this case, the OP was not cautious enough, and they likely either didn’t add enough bottle-bac, or their tank is not able to handle the bioload they added to it, as there shouldn’t be any meaningful levels of ammonia registered by testing (i.e. the ammonia should test to be 0) if the insta-cycle is done correctly. The best recommendation I’ve seen for insta-cycle is from Dr. Reef **based off a study they did for intsa/skip-cycling here on R2R.*** You add two to three times more bottle-bac than recommended, and you should be fine (provided you don’t start with an enormous bioload, that is). To be safe and avoid situations like the one this thread is about, people usually start with lower bioloads and build up over time.
All of that said, people also usually avoid situations like this one by mixing salt cautiously so they don’t end up having a salinity of 1.031 in their tanks.
So,
@Makubex , after taking advice from the
#fishmedic who will likely be able to help you treat your fish, what you should do next is learn from this experience and take things slowly with your reef. Remember you’re dealing with live animals here, not decorations. Be careful and make sure you keep your tank and water parameters in good conditions (as confirmed by testing and good reef tank parameter guidelines) to avoid situations like this in the future.
Good luck.
Links:
*
https://www.reef2reef.com/threads/bio-spira-works-great.668674/
**
https://www.reef2reef.com/threads/will-instant-cycle-set-me-up-for-disaster.914970/#post-10261919
***
https://www.reef2reef.com/threads/bacteria-in-a-bottle-myth-or-fact.403226/