Really big pic under that.
What we have here is an interrupted nitrogen cycle. The ammonia is starting to build up because the nitrosomonas in canister is asleep or dead but the nitrospira on the bio-wheel is working, so the little ammonia converted to nitrite is being processed into nitrate just fine.
pH 7.9 adj 7.4 (salinity)
Am 2.2ppm (prime ballast)
nI 0.00ppm, hard negative
nE about 45ppm (salinity is on different card)
Gh was 9°
Kh read 7°
Due to twice daily additions of prime the ammonia reading took 8 minutes to cook instead of the card instruction time.
So, in this case what do I do? All my ducks are happy but since I'm running antibiotic in the tank I have the carbon out and have been adding prime to de-toxify the nitrogen components. This means I need to not only do a water change but may want to reduce my tap water's Gh14 Kh2 down to something more reasonable then rebuild the water to Kh7.
The Am reading has to be dealt with immediately but since I'm treating for a medical condition which can intensify shock, I'm wanting to do only 25% water changes.
The water going in will have different alkalinity even though I can match hardness, pH and temp.
So... how many 25% changes do I have to do? Each change will dilute the previous ppm ammonia by 25%.
2.2 1.65 1.24 0.93 0.7 0.53...
Too many changes.
I added tripple sulfa yesterday and did a cursory test of nitrite, 1cc and 1 drop. So now I'm going to have to scrub the dosing of triple-sulfa with a 50% water change followed by an additional 30% two hours later in order to clear it and "hope" the nitrosomona wakes up. I say hope because I cheat.
My backup is going on the tank right after the 50% with twelve ounces fresh activated carbon in it.
This is a sorority with 10 + 2 + 2 + 4 + 1 in it. Tank volume is 15g, filtration capacity is 90g. This means that if I'd been using an appropriate sized filter for the 15g water mass I'd have lost my regular fish about eight hours ago and would now have distress on the betta.
How'd the tank get to this condition? Flexibactor. The tank has been under treatment by bombardment with Tetracycline+erythromiacin for 36 hours, followed by Furan-2/jungle fungus clear for 48 and now triple-sulfa and Lifeguard. for eighteen hours.
Scary readings are scary but remember not to panic. You love your fish but making a mistake while your stressed fish stress you can be lethal and is commonly what turns people off from keeping aquaria.
I cannot, by looking at the tank, tell that anything is "wrong"... the bloodfins fins are bold red and one of the mollies is prancing about. The water conditions in the tank are excellent and it aggravates me that I have to ruin that for the ammonia!
NO POOH POOHING my tank and stock count!