ammonia poisoning

Simmer overflow last night, didn't think much of it but decided to check ammonia levels this morning and it spiked to 2.0 from 0. since bacteria is established and went through the nitrite-nitrate cycle, would the ammonia harmless as in less toxic to fish??? I'll be doing a 50% water change...

Hi so I got my first 2 clowns in my tank today of 90 gallons. But every so often only ONE of the Clowns will go to the surface and grab air OCCASIONALLY, the other one swims and explores. Normally they swim like nothing wrong. if I get too close they dart to the bottom so I had to record from...

All, First time poster, long time lurker. I've tried to search for my issue but haven't really found anything that matches with what I'm experiencing so I'm reaching out. So I have a 9 month Fluval Evo 13.5, I recently did a 40% water change and cleaned the filter, pump and basic every day...

So, I thought I knew what I was doing - clearly I do not. Feeling a little overwhelmed and reaching out for help before I lose anything else. My ammonia is still high even after two water changes. Lost a six line wrasse and a valentini puffer yesterday - which I'm so bummed about. Fish were...

I had my biggest snail die on me. It’s probably been 2 days since, and I finally decided to check, and sure enough he was dead. I pulled out the main parts, but some of his body when flying throughout the tank. Should I be concerned about ammonia rising?

So, 3 weeks into QTing my Bandit Angel, I noticed he wasn't eating much and hiding the other day. Yesterday I found him laying on his side breathing heavily. I was doing 25% water changes twice a week, but likely overfed and resulted in some ammonia (about 0.2 according to the red sea test)...